West Bromwich Albion centre-back Semi Ajayi has been ruled out for "several weeks" after suffering another hamstring injury in the 2-0 win over Oxford United on Saturday.
The 31-year-old was playing for only the second time since returning from a five-month spell on the sidelines following hamstring surgery.
But Ajayi was substituted after 41 minutes at The Hawthorns and Albion confirmed, external he will now "enter a period of rehabilitation and will target a return before the season's conclusion".
"It's disappointing for him, frustrating for him and for us," boss Tony Mowbray told BBC Radio WM.