Bayern coach Jupp Heynckes said Vidal, 30, sustained the right knee injury during the club's training session on Sunday, reports Efe.
"Arturo has a loose body in his knee. That's preventing him from stretching. He's already on his way to Augsburg (to Dr. Ulrich Boenisch). He needs keyhole surgery on his knee," Heynckes said during a press conference ahead of Tuesday's German Cup semi-final match against Bayer Leverkusen.
"Arturo will definitely be out of action for a while," he added.
With this prognosis, Vidal is likely to miss Saturday's Bundesliga game against Hannover and next week's key duel with Real Madrid in the first leg of the Champions League semi-finals.
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