"He's going to be out for 10 weeks but he'll be ready for the start of the new season," Bilic told reporters on Friday.
"He played with pain (in) the last few games, then we decided to do the operation after the Liverpool game."
Bilic added that Andy Carroll, who has seven league goals this term but has not been fit since the draw at Sunderland last month, will also be unavailable for Sunday's trip to Burnley.
"Carroll has a hip problem. It was always 50-50 but he still feels it and it's not improving. He hasn't trained, it's impossible for him to play," Bilic said of the striker.
West Ham, who are 12th, have failed to win on the road in their last six league games. They visit 15th-placed Burnley knowing a win could see them finish in the top half of the standings for the second consecutive season.
(Reporting by Hardik Vyas in Bengaluru; Editing by Ken Ferris)
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