diff --git a/openfut-hook/src/fifa17.rs b/openfut-hook/src/fifa17.rs
index 7cd60e3..62b1f73 100644
--- a/openfut-hook/src/fifa17.rs
+++ b/openfut-hook/src/fifa17.rs
@@ -159,6 +159,7 @@ unsafe extern "system" fn worker(_: *mut core::ffi::c_void) -> u32 {
     crate::sbc_request_trace::install();
     crate::store_entry::install();
     crate::season_trace::install();
+    crate::season_team_compat::install();
     crate::kit_trace::install();
     0
 }
diff --git a/openfut-hook/src/lib.rs b/openfut-hook/src/lib.rs
index 434ddb4..bd10504 100644
--- a/openfut-hook/src/lib.rs
+++ b/openfut-hook/src/lib.rs
@@ -30,6 +30,8 @@ mod sbc_request_trace;
 #[cfg(feature = "fifa17")]
 mod sbc_trace;
 #[cfg(feature = "fifa17")]
+mod season_team_compat;
+#[cfg(feature = "fifa17")]
 mod season_trace;
 #[cfg(feature = "fifa17")]
 mod store_entry;
diff --git a/openfut-hook/src/season_team_compat.rs b/openfut-hook/src/season_team_compat.rs
new file mode 100644
index 0000000..95dac3a
--- /dev/null
+++ b/openfut-hook/src/season_team_compat.rs
@@ -0,0 +1,445 @@
+//! FIFA 17 Offline Seasons game-setup team compatibility candidate.
+//!
+//! `FUT::SeasonsManagerOfflineHelper` first projects the authentic dynamic pair
+//! `[fixture_team, user_team]`. Later, `futSelectTeam::SetupTeamsInfo()` asks
+//! `CardsGameSetupAdapter.GetTeam(side)` while rebuilding its panel state. The
+//! first native reads expose the correct fixture and user teams on distinct GetTeam
+//! sides. A later repeated read of the user-returning side is fed into SetTeam's
+//! inverse side mapping and duplicates the user's XI over the opponent.
+//!
+//! This default-off candidate corrects that source read, not SetTeam or the final
+//! writer. It records the projector pair, requires one native observation of each
+//! team on distinct sides, and permits one correction on the next repeated
+//! user-team read. Missing or conflicting evidence always preserves native behavior.
+
+use core::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
+use std::sync::Mutex;
+
+use windows_sys::Win32::System::LibraryLoader::GetModuleHandleA;
+
+use crate::sbc_trace::{readable_range, target_va, validate_cards_build};
+use crate::season_trace::{install_detour, install_detour_reloc, rd_i32};
+use crate::write_log;
+
+const ENABLE_ENV: &str = "OPENFUT_FIFA17_SEASON_TEAM_COMPAT";
+
+const FIXTURE_PROJECTOR_RVA: usize = 0x0fc500;
+const GET_TEAM_RVA: usize = 0x0054a0;
+
+const FIXTURE_PROJECTOR_SIGNATURE: [u8; 19] = [
+    0x40, 0x57, 0x41, 0x54, 0x41, 0x56, 0x48, 0x83, 0xec, 0x30, 0x48, 0xc7, 0x44, 0x24, 0x20, 0xfe,
+    0xff, 0xff, 0xff,
+];
+const GET_TEAM_SIGNATURE: [u8; 17] = [
+    0x48, 0x8b, 0x05, 0xb9, 0x8a, 0x2d, 0x00, 0x4c, 0x8b, 0x80, 0x50, 0x03, 0x00, 0x00, 0x49, 0xff,
+    0xe0,
+];
+
+const UNKNOWN_SIDE: i32 = -1;
+
+static REPAIR_ACTIVE: AtomicBool = AtomicBool::new(false);
+static FIXTURE_PROJECTOR_TRAMPOLINE: AtomicUsize = AtomicUsize::new(0);
+static GET_TEAM_TRAMPOLINE: AtomicUsize = AtomicUsize::new(0);
+static TEAM_STATE: Mutex<TeamState> = Mutex::new(TeamState::empty());
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+struct TeamState {
+    fixture_team: i32,
+    user_team: i32,
+    fixture_get_side: i32,
+    user_get_side: i32,
+    correction_used: bool,
+}
+
+impl TeamState {
+    const fn empty() -> Self {
+        Self {
+            fixture_team: 0,
+            user_team: 0,
+            fixture_get_side: UNKNOWN_SIDE,
+            user_get_side: UNKNOWN_SIDE,
+            correction_used: false,
+        }
+    }
+
+    fn capture(&mut self, fixture_team: i32, user_team: i32) -> bool {
+        if !valid_pair(fixture_team, user_team) {
+            *self = Self::empty();
+            return false;
+        }
+        *self = Self {
+            fixture_team,
+            user_team,
+            fixture_get_side: UNKNOWN_SIDE,
+            user_get_side: UNKNOWN_SIDE,
+            correction_used: false,
+        };
+        true
+    }
+
+    fn observe_get_team(&mut self, side: i32, native_team: i32) -> GetTeamDecision {
+        if !valid_side(side) || !valid_pair(self.fixture_team, self.user_team) {
+            return GetTeamDecision::native(native_team);
+        }
+
+        if native_team == self.fixture_team {
+            if (self.fixture_get_side != UNKNOWN_SIDE && self.fixture_get_side != side)
+                || self.user_get_side == side
+            {
+                return self.clear_on_conflict(native_team);
+            }
+            let first_observation = self.fixture_get_side == UNKNOWN_SIDE;
+            self.fixture_get_side = side;
+            return GetTeamDecision {
+                team: native_team,
+                event: if self.user_get_side != UNKNOWN_SIDE {
+                    DecisionEvent::NativePairConfirmed
+                } else if first_observation {
+                    DecisionEvent::FixtureObserved
+                } else {
+                    DecisionEvent::None
+                },
+            };
+        }
+
+        if native_team == self.user_team {
+            if self.user_get_side == UNKNOWN_SIDE {
+                if self.fixture_get_side == side {
+                    return self.clear_on_conflict(native_team);
+                }
+                self.user_get_side = side;
+                return GetTeamDecision {
+                    team: native_team,
+                    event: if self.fixture_get_side != UNKNOWN_SIDE {
+                        DecisionEvent::NativePairConfirmed
+                    } else {
+                        DecisionEvent::UserObserved
+                    },
+                };
+            }
+            if self.user_get_side != side {
+                return self.clear_on_conflict(native_team);
+            }
+            if !self.correction_used && self.fixture_get_side != UNKNOWN_SIDE {
+                self.correction_used = true;
+                return GetTeamDecision {
+                    team: self.fixture_team,
+                    event: DecisionEvent::Corrected,
+                };
+            }
+        }
+
+        GetTeamDecision::native(native_team)
+    }
+
+    fn clear_on_conflict(&mut self, native_team: i32) -> GetTeamDecision {
+        *self = Self::empty();
+        GetTeamDecision {
+            team: native_team,
+            event: DecisionEvent::ConflictingNativePair,
+        }
+    }
+}
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+enum DecisionEvent {
+    None,
+    FixtureObserved,
+    UserObserved,
+    NativePairConfirmed,
+    ConflictingNativePair,
+    Corrected,
+}
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+struct GetTeamDecision {
+    team: i32,
+    event: DecisionEvent,
+}
+
+impl GetTeamDecision {
+    const fn native(team: i32) -> Self {
+        Self {
+            team,
+            event: DecisionEvent::None,
+        }
+    }
+}
+
+const fn valid_side(side: i32) -> bool {
+    side == 0 || side == 1
+}
+
+const fn valid_pair(fixture_team: i32, user_team: i32) -> bool {
+    fixture_team > 0 && user_team > 0 && fixture_team != user_team
+}
+
+fn enabled(value: Option<&str>) -> bool {
+    value == Some("1")
+}
+
+fn exact_signature(current: &[u8], expected: &[u8]) -> bool {
+    current == expected
+}
+
+unsafe fn target_matches(base: usize, rva: usize, signature: &[u8]) -> bool {
+    let Some(target) = target_va(base, rva) else {
+        return false;
+    };
+    readable_range(target, signature.len())
+        && exact_signature(
+            core::slice::from_raw_parts(target as *const u8, signature.len()),
+            signature,
+        )
+}
+
+type FixtureProjectorFn = unsafe extern "system" fn(usize, usize, usize, usize) -> usize;
+type GetTeamFn = unsafe extern "system" fn(usize, i32) -> i32;
+
+unsafe extern "system" fn fixture_projector_wrapper(
+    context: usize,
+    output_pair: usize,
+    r8: usize,
+    r9: usize,
+) -> usize {
+    let trampoline = FIXTURE_PROJECTOR_TRAMPOLINE.load(Ordering::Acquire);
+    if trampoline == 0 {
+        return 0;
+    }
+    let original: FixtureProjectorFn = core::mem::transmute(trampoline);
+    let result = original(context, output_pair, r8, r9);
+
+    let pair = rd_i32(output_pair).zip(rd_i32(output_pair.saturating_add(4)));
+    let captured = pair.is_some_and(|(fixture_team, user_team)| {
+        TEAM_STATE
+            .lock()
+            .map(|mut state| state.capture(fixture_team, user_team))
+            .unwrap_or(false)
+    });
+    match pair {
+        Some((fixture_team, user_team)) if captured => write_log(&format!(
+            "SEASON_TEAM_COMPAT: fixture captured fixture={fixture_team} user={user_team}\n"
+        )),
+        Some((fixture_team, user_team)) => write_log(&format!(
+            "SEASON_TEAM_COMPAT: invalid fixture pair [{fixture_team},{user_team}]; inactive\n"
+        )),
+        None => {
+            if let Ok(mut state) = TEAM_STATE.lock() {
+                *state = TeamState::empty();
+            }
+            write_log("SEASON_TEAM_COMPAT: unreadable fixture pair; inactive\n");
+        }
+    }
+    result
+}
+
+unsafe extern "system" fn get_team_wrapper(adapter: usize, side: i32) -> i32 {
+    let trampoline = GET_TEAM_TRAMPOLINE.load(Ordering::Acquire);
+    if trampoline == 0 {
+        return 0;
+    }
+    let original: GetTeamFn = core::mem::transmute(trampoline);
+    let native_team = original(adapter, side);
+    if !REPAIR_ACTIVE.load(Ordering::Acquire) {
+        return native_team;
+    }
+
+    let decision = TEAM_STATE
+        .lock()
+        .map(|mut state| state.observe_get_team(side, native_team))
+        .unwrap_or_else(|_| GetTeamDecision::native(native_team));
+    match decision.event {
+        DecisionEvent::FixtureObserved => write_log(&format!(
+            "SEASON_TEAM_COMPAT: fixture observed side={side} team={native_team}\n"
+        )),
+        DecisionEvent::UserObserved => write_log(&format!(
+            "SEASON_TEAM_COMPAT: user observed side={side} team={native_team}\n"
+        )),
+        DecisionEvent::NativePairConfirmed => write_log(&format!(
+            "SEASON_TEAM_COMPAT: native pair confirmed side={side} team={native_team}\n"
+        )),
+        DecisionEvent::ConflictingNativePair => write_log(&format!(
+            "SEASON_TEAM_COMPAT: conflicting native pair at side={side}; state cleared\n"
+        )),
+        DecisionEvent::Corrected => write_log(&format!(
+            "SEASON_TEAM_COMPAT: corrected GetTeam side={side} native={native_team} fixture={}\n",
+            decision.team
+        )),
+        DecisionEvent::None => {}
+    }
+    decision.team
+}
+
+unsafe fn worker() {
+    let mut base = 0usize;
+    for _ in 0..600u32 {
+        base = GetModuleHandleA(c"CardsDLL_Win64_retail.dll".as_ptr().cast()) as usize;
+        if base != 0 {
+            break;
+        }
+        std::thread::sleep(std::time::Duration::from_millis(500));
+    }
+    if base == 0 || !validate_cards_build(base) {
+        write_log("SEASON_TEAM_COMPAT: CardsDLL unavailable/invalid; inactive\n");
+        return;
+    }
+    if !target_matches(base, FIXTURE_PROJECTOR_RVA, &FIXTURE_PROJECTOR_SIGNATURE)
+        || !target_matches(base, GET_TEAM_RVA, &GET_TEAM_SIGNATURE)
+    {
+        write_log("SEASON_TEAM_COMPAT: target signature mismatch; inactive\n");
+        return;
+    }
+
+    if !install_detour(
+        base,
+        FIXTURE_PROJECTOR_RVA,
+        "OfflineSeason_fixture_projector",
+        FIXTURE_PROJECTOR_SIGNATURE.len(),
+        &FIXTURE_PROJECTOR_SIGNATURE,
+        fixture_projector_wrapper as *const () as usize,
+        &FIXTURE_PROJECTOR_TRAMPOLINE,
+    ) {
+        write_log("SEASON_TEAM_COMPAT: fixture projector hook failed; inactive\n");
+        return;
+    }
+    if !install_detour_reloc(
+        base,
+        GET_TEAM_RVA,
+        "CardsGameSetupAdapter_GetTeam",
+        GET_TEAM_SIGNATURE.len(),
+        &GET_TEAM_SIGNATURE,
+        3,
+        7,
+        get_team_wrapper as *const () as usize,
+        &GET_TEAM_TRAMPOLINE,
+    ) {
+        write_log("SEASON_TEAM_COMPAT: GetTeam hook failed; inactive\n");
+        return;
+    }
+
+    REPAIR_ACTIVE.store(true, Ordering::Release);
+    write_log("SEASON_TEAM_COMPAT: candidate ARMED; exact fixture evidence gate enabled\n");
+}
+
+pub(crate) fn install() {
+    if !enabled(std::env::var(ENABLE_ENV).ok().as_deref()) {
+        write_log("SEASON_TEAM_COMPAT: disabled\n");
+        return;
+    }
+    write_log("SEASON_TEAM_COMPAT: requested; deferred signature validation starting\n");
+    std::thread::spawn(|| unsafe { worker() });
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn feature_is_default_off() {
+        assert!(!enabled(None));
+        assert!(!enabled(Some("0")));
+        assert!(!enabled(Some("true")));
+        assert!(enabled(Some("1")));
+    }
+
+    #[test]
+    fn signature_validation_is_exact() {
+        assert!(exact_signature(&GET_TEAM_SIGNATURE, &GET_TEAM_SIGNATURE));
+        let mut changed = GET_TEAM_SIGNATURE;
+        changed[0] ^= 1;
+        assert!(!exact_signature(&changed, &GET_TEAM_SIGNATURE));
+    }
+
+    #[test]
+    fn invalid_fixture_never_arms_state() {
+        let mut state = TeamState::empty();
+        assert!(!state.capture(0, 130000));
+        assert!(!state.capture(73, 73));
+        assert_eq!(
+            state.observe_get_team(0, 130000),
+            GetTeamDecision::native(130000)
+        );
+    }
+
+    #[test]
+    fn fixture_must_be_observed_natively_before_correction() {
+        let mut state = TeamState::empty();
+        assert!(state.capture(73, 130000));
+        assert_eq!(
+            state.observe_get_team(1, 130000),
+            GetTeamDecision {
+                team: 130000,
+                event: DecisionEvent::UserObserved
+            }
+        );
+        assert_eq!(
+            state.observe_get_team(1, 130000),
+            GetTeamDecision::native(130000)
+        );
+        assert_eq!(state.fixture_get_side, UNKNOWN_SIDE);
+        assert!(!state.correction_used);
+    }
+
+    #[test]
+    fn correction_requires_native_pair_then_is_one_shot() {
+        let mut state = TeamState::empty();
+        assert!(state.capture(73, 130000));
+        assert_eq!(
+            state.observe_get_team(0, 73),
+            GetTeamDecision {
+                team: 73,
+                event: DecisionEvent::FixtureObserved
+            }
+        );
+        assert_eq!(
+            state.observe_get_team(1, 130000),
+            GetTeamDecision {
+                team: 130000,
+                event: DecisionEvent::NativePairConfirmed
+            }
+        );
+        assert_eq!(
+            state.observe_get_team(1, 130000),
+            GetTeamDecision {
+                team: 73,
+                event: DecisionEvent::Corrected
+            }
+        );
+        assert_eq!(
+            state.observe_get_team(1, 130000),
+            GetTeamDecision::native(130000)
+        );
+    }
+
+    #[test]
+    fn second_fixture_replaces_all_prior_state() {
+        let mut state = TeamState::empty();
+        assert!(state.capture(73, 130000));
+        assert_eq!(state.observe_get_team(0, 73).team, 73);
+        assert_eq!(state.observe_get_team(1, 130000).team, 130000);
+        assert_eq!(state.observe_get_team(1, 130000).team, 73);
+
+        assert!(state.capture(240, 130000));
+        assert_eq!(state.fixture_get_side, UNKNOWN_SIDE);
+        assert_eq!(state.user_get_side, UNKNOWN_SIDE);
+        assert!(!state.correction_used);
+        assert_eq!(state.observe_get_team(0, 240).team, 240);
+        assert_eq!(state.observe_get_team(1, 130000).team, 130000);
+        assert_eq!(state.observe_get_team(1, 130000).team, 240);
+    }
+
+    #[test]
+    fn conflicting_fixture_sides_fail_closed() {
+        let mut state = TeamState::empty();
+        assert!(state.capture(73, 130000));
+        assert_eq!(
+            state.observe_get_team(0, 73).event,
+            DecisionEvent::FixtureObserved
+        );
+        assert_eq!(
+            state.observe_get_team(1, 73).event,
+            DecisionEvent::ConflictingNativePair
+        );
+        assert_eq!(state, TeamState::empty());
+    }
+}