Norwich midfielder Elliott Bennett will be sidelined until the new year after undergoing knee ligament surgery.
Bennett was taken for scans after experiencing pain following Norwich's 2-2 draw against Everton in their opening game of the new English Premier League campaign on Saturday.
The decision was made to operate on Wednesday and Canaries manager Chris Hughton expects the former Brighton star to be out of action for at least the first half of the season.
"Losing Elliott is a big blow for us," Hughton said. "It's really bad news for the player first and foremost because I felt he did well against Everton."
"He played the game on Saturday but didn't have a great reaction and we have since found that there was a knee problem that was operated on. It will keep him out for a number of months."
There was more bad news for Hughton as striker Gary Hooper, a recent £5m signing from Celtic, will miss this weekend's trip to Hull as he continues to make slow progress in his recovery from a shin injury suffered in a pre-season friendly against Panathinaikos.
"Gary still hasn't trained yet. We felt progress might have been a little quicker than it has turned out," Hughton said.