Swansea defender Kyle Bartley is set to spend two months on the sidelines with a medial ligament injury.
Bartley sustained the injury during the final 10 minutes of Swansea's 4-1 Carabao Cup second-round win at MK Dons on Tuesday.
The 26-year-old underwent a scan on Wednesday and has been ruled out for six to eight weeks.
Swansea say Bartley will see a knee specialist next week to assess the injury further.
Bartley spent last season on loan at Leeds but signed a new four-year Swansea contract earlier this month.
He made his first Premier League start since December 2015 in Swansea's 4-0 home defeat to Manchester United last weekend.