Neil Warnock says Anfernee Dijksteel is facing a spell out, but Paddy McNair and Marc Bola are back in full training.
Dutch defender Dijksteel was forced off with Boro in the lead against Blackpool at the weekend at the Riverside, a match which the visitors went on to win 2-1.
Bola and McNair have not featured since our previous home game, a 1-1 draw with Blackburn.
“I think Dijksteel will be out a substantial time,” Warnock said.
"I don’t know how long exactly but I don’t expect to see him for a few weeks.
“We’ve got Bola and Paddy who came back into full time training yesterday
“But we’re treading warily really when it comes to bringing them back.”