The 27-year-old defender was dismissed in Saturday's 2-0 defeat at Torquay for denying Gulls striker Chris Zebroski a clear goalscoring opportunity and will serve a one-match ban.
Luke Foster and Darius Charles will now battle it out to replace the centre-back in the starting line-up.
Westley could also be tempted to make further changes following his side's first defeat in five games against the Gulls, with striker Craig Reid and top-scorer Byron Harrison pushing for starts along with midfielders Stacy Long and Robert Sinclair.
Midfielder Darren Murphy, who has made one appearance this season due to a dislocated shoulder and broken leg, could return to the squad.
Source: PA
Source: PA