Boro beat Stoke City 3-0 last time out after goals from Grant Hall, Paddy McNair and substitute Nathanial Mendez-Laing.
The Teessiders changed formation in the first half, switching from a back three to a back four, which allowed them to get a grip of the match.
Warnock certainly has competition for places, with Mendez-Laing, Yannick Bolasie, Neeskens Kebano and Marvin Johnson all competing for places in the wide areas.
The Boro boss is also hopeful Marcus Tavernier and Ashley Fletcher will be able to return from injury this week.
With ten games to go, Warnock’s side sit eight points off the play-off places and will need to go on a run to finish inside the top six.
Here’s who we think could start against Preston.