The Teessiders have picked up just one point from their last five games, with Warnock admitting there are some players who want to leave the club.
With four games remaining, the Boro boss will therefore be assessing his squad as he looks at the areas he needs to strengthen for the 2021/22 campaign.
Warnock’s former side Rotherham are in desperate need of points as they look to avoid relegation from the Championship.
The Millers are four points from safety with six games left to play after losing their last two games against Coventry and Birmingham.
Paul Warne’s side shouldn’t be taken lightly, though, after beating Boro 3-0 at the Riverside earlier in the season.
Here’s the Boro side we think could start against Rotherham.

9. LW: Marvin Johnson
Made an impact after coming off the bench against QPR and is one of the players who will be out of contract this summer. Photo: George Wood

10. CAM: Duncan Watmore
One of the players Warnock has namechecked when discussing the players who he can build around next season. The forward is always full of energy. Photo: Stu Forster

11. ST: Chuba Akpom
Was left on the bench against QPR and needs to show he can play a part next season. Photo: Jacques Feeney