Bristol City loan signing Liam Moore has undergone a successful hernia operation, HITC Sport understands.
Moore has been playing through the pain barrier since moving to Ashton Gate from Leicester City on loan on transfer deadline day.
The England Under-21 international has made only three appearances for the Robins since arriving from the Foxes.
The hernia problem forced Moore to come off in the recent game against Reading, and he ended up missing last weekend's draw with Ipswich Town at Portman Road.
After undergoing further scans, it was decided it was best for Moore to go under the knife now to try and resolve the double hernia issue.
It means that Moore will not be available for this weekend's clash with fellow strugglers Milton Keynes Dons.
News of Moore's injury will come as a major blow for Robins boss Steve Cotterill as he looks to have his best players available and plot a move to lift his side off the bottom.
Bristol City have won just one of their opening nine Championship games, and Moore was seen as someone who would help to solve the team's defensive problems.
Moore is targeting a return to fitness after the international break and is hoping to be available for the game against Nottingham Forest on October 16.