Norwich manager Chris Hughton will be without key duo Robert Snodgrass and Anthony Pilkington for "several weeks".
Snodgrass limped out of training on Friday with a knee injury which saw him sit out Saturday's 2-1 defeat to Newcastle.
Fellow midfielder Pilkington was stretchered off early in the second half at St James' Park after aggravating a hamstring problem which saw him miss the Republic of Ireland's recent friendlies.
Hughton's midfield options for the visit of fellow strugglers Crystal Palace on Saturday are already limited with Elliott Bennett and Alex Tettey sidelined for the rest of the year.
Dutch striker Ricky van Wolfswinkel missed the Newcastle defeat with a toe injury and is not expected to return until Swansea's visit on December 15.
"Robert Snodgrass (knee) and Anthony Pilkington (hamstring) will be out for 'several weeks' with injuries," Norwich's Twitter feed confirmed.
"Van Wolfswinkel's target for return to contention is the Swansea game."