The 19-year-old spent the first half of the season on loan at 1. FC Nürnberg, where he made two appearances in the Regionalliga Bayern.
Mustapha signed a new contract with the club last summer after an impressive 2024/25 campaign, during which he was named Palace Under-21s’ Player of the Season.
Hindolo’s loan spell will officially conclude on 1st January 2026.