The midfielder performed superbly in the opening-weekend win over Leeds United, and was singled out for praise by manager Ole Gunnar Solskjaer afterwards, but was only able to manage a cameo off the bench in the 1-1 draw at Southampton.
Ole admitted on Sunday that the Academy product has been struggling with a groin problem, and steps have now been taken to rectify it.
“Scott has undergone surgery for an ongoing groin injury that was causing significant pain when playing,” said the club in an official statement.
“Having tried all other treatment options in pre-season, surgery was deemed necessary to resolve the issue.