Boro boss Tony Pulis says captain Grant Leadbitter will be monitored until late ahead of Friday's game against Leeds United.
The skipper injured his hamstring after scoring the penalty at Sunderland last weekend.
“When Grant took the penalty [against Sunderland], I think if you look back, you can see he felt the top of his hamstring,” Pulis said.
“That was a real concern for him straightaway.
“Fingers crossed he’ll be fit. He’s an outside chance and we will assess it last minute.”
The boss also praised the decision to overturn the red card shown to Adama Traore during last weekend’s match against Sunderland.
With the Black Cats already a man down in the game, Boro too were reduced to ten during the first half at the Stadium of Light.
But a potential four-match suspension for Adama has since been overruled following a successful appeal by the club.
“I’ve got to say thank you to the FA, the Football League, and the panel for making the decision,” Pulis said.
“That’s two that have been overturned since I’ve been here.
“The disappointing thing is that on the day we’ve suffered. We can’t turn the clock back in that respect.
“We’ve been very unfortunate to play those two games with ten men.
“When you look at it, and the panel has looked at it, it was unjustly done in lots of ways. We’re pleased to have Adama fit and available to go.”
Rudy Gestede, the subject of Boro’s other successful appeal, has since been ruled out for the remainder of the season with a fractured ankle, while Fabio is also still sidelined with injury.