BAYERN Munich midfielder Arturo Vidal could miss Champions League semi-final against Real Madrid after coach Jupp Heynckes revealed on Monday that he will undergo minor knee surgery after picking up an injury during training.
The 30-year-old Chile international is now sidelined for Tuesday's German Cup semi-final against Bayer Leverkusen and is also unlikely to make their Champions League semi-final first leg against Real Madrid next week.
Bayern are chasing a treble of titles having already secured the Bundesliga crown.
"He slipped and turned his knee," Heynckes said of Vidal's injury in training on Sunday.
"I talked with the doctor. He did a scan. Arturo will need to undergo a minor arthroscopic surgery. He is already on his way to Augsburg. He is now ruled out for the short-term for sure."
Nevertheless, losing Vidal for forthcoming key games is a blow to Bayern's hunt for the treble.
Vidal will miss Tuesday's German Cup semi-final against his old club Bayer Leverkusen.
French midfielder Corentin Tolisso is also struggling to recover from a knock.
A cup victory at Leverkusen would put Bayern in the May 19 final in Berlin - another step towards repeating their 2013 treble.
The Bavarian giants have already secured a sixth straight Bundesliga title, holding a massive 20-point lead over Schalke at the top of the table with four games left.