Swansea City winger Wayne Routledge is set to miss the next four weeks with a calf strain.
Routledge, 30, came off during the first half of Saturday's 5-0 home defeat against Chelsea.
He has played 19 of the Welsh club's 22 matches in the Premier League so far this season.
Captain Ashley Williams is also likely to miss the FA Cup fourth round trip to Blackburn on Saturday with a shoulder injury.
The Wales skipper is expected to return to action next week.
Ecuador winger Jefferson Montero, 25, who has been out with a hamstring injury since the 1-0 win over Aston Villa on Boxing Day, is back in training along with midfielder Leon Britton, who missed the Chelsea match with a slight groin strain.