Bayern Munich captain Mark van Bommel admitted Friday that he could be sidelined for longer than expected with a broken toe.
"I still don't know when I can return," the Dutch international told the Munich daily Abendzeitung.
"There's no chance it will be against Dortmund," he added, referring to Bayern's next Bundesliga game on 12 September.
Van Bommel, 32, underwent surgery after breaking his toe in the opening Bundesliga game of the season and had initially expected to be sidelined for a month.
The midfielder could however be fit for Bayern's UEFA Champions League clash against Juventus on 30 September.