The Bundesliga champions could be without the Chilean midfielder for decisive weeks in their season as he requires a small operation on his knee
Arturo Vidal is a doubt for both legs of Bayern Munich's Champions League semi-final against Real Madrid as he requires knee surgery, head coach Jupp Heynckes has confirmed.
The 30-year-old felt pain in his right knee during training on Sunday and was sent for further tests.
Heynckes says the Chilean now requires a small operation to remove "a loose body" from within the joint, meaning he faces a spell on the sidelines.