A season on, ScoutGPT replays every possession he touched in his last year at the club, with someone else in his place.
Modeling Matches as Language: A Generative Transformer Approach for Counterfactual Player Valuation in Football
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Son's counterfactual runs over his 2024/25 possessions, so part of it sits inside the training half. That is why the model replays Son as himself. On the held-out half his self-replay matches his real record within 1%, which is the control for the rest.