Tony Pulis is keeping his cards close to his chest ahead of Saturday's match against Leeds United (kick-off 1pm).
Striking duo Jordan Hugill and Britt Assombalonga both limped off in Boro's Emirates FA Cup defeat to Newport County, and the Boro boss had previously revealed that midfielders George Saville (ankle) and Lewis Wing (groin) were also cause for concern.
"We'll have a look at them today and see how they physically and mentally," Pulis said.
"Yesterday we didn't do a lot after travelling back from Newport and the lads missing out on a night's sleep.
"Having 24 hours of no rest and non-stop travelling - we just opened them up a bit yesterday.
"If we have to leave one or two out then we we'll do that. There's 16 games still to go and we have to be mindful of that. We'll pick the team as we see fit."