Diego Simeone confirmed Julián Álvarez will be in Atlético Madrid's squad for the match against Athletic Club, calling it an "opportunity" for the forward to turn his situation around after failing to secure a move to Barcelona this summer. Álvarez publicly expressed his desire to leave Atlético during the World Cup, but the club refused to sanction a transfer to Barça, with CEO Miguel Ángel Gil Marín stating he "won't negotiate with Barcelona under any circumstances." The Argentina international has played just 24 minutes in La Liga this season and was whistled by fans when he came off the bench against Villarreal on Aug. 23. Simeone said Álvarez is "training very well" and will be part of the traveling squad to Bilbao, adding that the club expects the best from him. Simeone emphasized that life is full of opportunities and this moment allows Álvarez to adjust, learn, and focus less on judgment.

Atlético also signed Jonathan David on loan from Juventus on the final day of the transfer window due to forward shortages, with Simeone noting David's past success at Lille and his need to adapt quickly to the team.