Swansea defender Kyle Bartley has been ruled out for three months after undergoing knee surgery.
Bartley was injured in the Swans' Carabao Cup game at MK Dons on August 22 and was initially expected to be sidelined for six to eight weeks.
But scans revealed the problem was more serious than first feared and the 26-year-old had an operation this week.
Swans boss Paul Clement told his club's official website: "We were disappointed to lose Kyle. He has now had surgery and we expect him to be out for around 12 weeks.
"The period of 12 weeks is an estimate, and we will have to see how Kyle responds to his rehabilitation."
Swansea have had a bid accepted for Hull midfielder Sam Clucas and expect the transfer to be completed within the next 48 hours.
Press Association Sport understands the deal is worth £15million with another potential £1.5m in add-ons.
Swansea targeted Clucas following the club-record sale of Gylfi Sigurdsson to Everton last week for a fee around the £45million mark.
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