The Austria international hobbled off during a preseason outing in northern Italy and it has now been decided that going under the knife is the best option for the 20-year-old.
The wing back suffered the injury during the first half of the game in Arco in northern Italy and although he was ruled out of action for six to eight weeks after consultation with club medics the following morning, they opted to wait until Monday before deciding on the best course of treatment.
Bayern, though, has now released confirmation on its official website that Alaba will undergo surgery on his left foot on Tuesday.
However, on the plus side for the Bavarians, Rafinha, who suffered ankle ligament damage against the Partenopei, does not need an operation.
The injuries sustained by Alaba and Rafinha had prompted speculation that the Bundesliga, DFB-Pokal and Champions League runner-up might try to sign a full back before the start of the new season, but club CEO Karl-Heinz Rummenigge subsequently ruled out making any panic buys.
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