On-loan Arsenal defender Calum Chambers is set to be out of action for a number of weeks after picking up a stress fracture of his foot.
The 22 year old has been drawn praise from Boro manager Aitor Karanka for his performances this season, so to miss him will be a blow for the Teesiders.
“It’s a stress fracture in his foot,” said Karanka. “I don’t know how long he will be out because sometimes you think it’s going to be one or two weeks and maybe it’s three or four.
“I don’t know. At the moment, he’s trying to be fit as soon as possible.”
Last month, the former Real Madrid man said of the Arsenal man, “He has a lot of good things.
“He is good with the ball, he’s strong in the air, sometimes he may look as if he’s not aggressive or strong, but he is really strong and he’s using that experience to play.”
“I’ve no doubt that he can play at Arsenal. For me, he’s a really good central defender.”