According to reporter Patrick Berger, Dortmund forward Bayer is doubtful for playing against Villarreal.
Dortmund will face Villarreal at home in the fifth round of the Champions League. Patrick Berger revealed that Dortmund forward Bayer withdrew from today's training early due to a minor muscle problem. He left the training base by car at 11:49 a.m. local time and went directly to undergo a test. There is doubt whether he can play against Villarreal.
source:7m sport