The Dutch midfielder sustained the injury during training ahead of the weekend La Liga match against Villarreal. Tests indicate a possible muscle tear that could keep him out for four weeks, potentially missing up to seven matches across all competitions.
De Jong will be absent for the Copa del Rey semi-final second leg against Atletico Madrid, the Champions League Round of 16 tie, and several La Liga fixtures. His absence creates a midfield gap just as Pedri had returned to action, forcing Flick to consider alternatives like Marc Bernal, Marc Casado, or Eric García.