Westley has returned to Boro, who he guided to back-to-back promotions before leaving for Preston, to replace Gary Smith who was sacked last week.
He will be without Miguel Comminges, who is suspended after his red card in Friday's 1-1 draw against Crawley.
With Lee Hills a doubt with a hamstring problem, David Gray is set to fill in at left-back.
Midfielder Gavin Mahon is struggling with a knock but new signings Alex Smith and Roarie Deacon could be added to the squad.
Defender Smith joined on loan from Fulham on Thursday and forward Deacon was a free agent after leaving Sunderland, but neither signed in time to face Crawley.
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- Alex Smith
- Miguel Comminges