The defender could face parent club Die Roten when S04 visit in the DFB-Pokal, but he is not prepared to do them any favours
Holger Badstuber says Schalke are determined to ruin Bayern Munich's hopes of the treble when they meet in the DFB-Pokal on Wednesday.
Carlo Ancelotti's side maintained their five-point lead at the top of the Bundesliga with an 8-0 demolition of Hamburg on Saturday, while their place in quarter-finals of the Champions League looks all but assured after their 5-1 last-16 first-leg win over Arsenal.
Bayern have won six of their eight matches since their return from Germany's mid-season break, and talk of challenging to replicate the treble won in 2012-13 has been growing given their recent performances.