The former City midfielder played in the 2-1 win over Nottingham Forest on August 13 but since that match has not featured against Blackpool, Wycombe or Yeovil.
Summerbee, who is fighting for a contract with the league one side, may find himself surplus to requirements now that the Robins have added a striker to their ranks.
Last season, the Bantams tried to tie him up on a 12-month deal but he turned down their offer to stay.