Boro were beaten 1-0 by Blackburn at the weekend and suffered a couple of injury setbacks, with Dael Fry leaving the pitch with a cut below his eye while Marcus Tavernier was forced off with a knee injury.
Warnock will assess his squad ahead of the Rotherham match which was rearranged from Boxing Day due to a Covid-19 outbreak in the Millers camp.
A win would move Boro level on points with sixth-place Bournemouth and give the Teessiders a much-needed lift ahead of their trip to league leaders Norwich at the weekend.
Our Boro writer Joe Nicholson has picked the side he would start against Rotherham – scroll down and flick through the pages of our picture gallery to see if you agree with his selections:
A win would move Boro level on points with sixth-place Bournemouth and give the Teessiders a much-needed lift ahead of their trip to league leaders Norwich at the weekend.