West Brom centre-back Jonas Olsson will be out for between four to six weeks as he will undergo minor Achilles surgery.
The 31-year-old Sweden international is scheduled to have his operation in Portugal on Friday.
"I have been struggling with this on and off for some time and I've come to the point where it feels like surgery would help it," he said.
"The recovery time is short so I hope to be back 100% some time after the New Year."
Olsson has played just five games so far this season, with his last outing coming on 24 September in a Capital One Cup win over Hull.