With Bull's thigh injury resurfacing in the 1-0 defeat at Darlington, Russell Slade has searched the market for a left sided replacement.
His efforts have not gone unrewarded, with the former England Under 21 cap heading to Blundell Park later this week with a short term contract likely.
Gordon spent last season with Coventry but failed to earn a new deal at Highfield Road, whilst wanting a return to the North East to near his son.
A trial at Sunderland didn't materialise into a contract, with Grimsby the next stop.
A quick wingback with a mean eye for goal, especially from free-kicks. Gordon is further testament to the quality that Slade is bringing in and the finances that chairman John Fenty is making available.
Gordon won't arrive in time for tonight's game with Boston, instead club legend John McDermott will step in with Jason Crowe moving over to the left hand wing.