Pundit Michael Stewart believes the depth of the Rangers squad could prove a huge issue as they head into their showdown with Celtic.
The gap at the top of the Premiership is down to four points after Gio van Bronckhorst's side could only draw at Aberdeen on Tuesday night, their city rivals having beaten Hibs the night before.
Rangers travel to Parkhead on January 2 for the rearranged derby, with the game pushed back to accommodate the winter break.
