On-loan Aston Villa left-back Warnock missed last weekend's 2-1 home defeat to Ipswich with an infected toe and if he does not recover in time Marcos Alonso is poised to keep his place.
That is not something too many Wanderers players can have been overly confident of doing of late as Dougie Freedman continues to rotate his line-up during the opening weeks of his reign.
Last Wednesday's victory at Blackburn came after six alterations to the side that drew at Brighton, and three more changes were in the offing against Ipswich.
Jacob Butterfield and Lee Chung-Yong were on the bench for the latter contest and are pushing for a start once more, while Martin Petrov adds another attacking midfield option having overcome a hamstring strain.
Stuart Holden has returned to training but remains a couple of months away from first-team action, while fellow knee-injury victims David Wheater and Josh Vela are still sidelined.