The Blues club captain has travelled with the party to Home Park despite not having played any match football this season.
Manager Alex McLeish has confirmed that Johnson has been added to the squad for the match at Home Park because of injuries and a virus to a number of his othert first team players.
The Northern Ireland international midfielder sustained a back injury which required surgery during the close season and although McLeish would have preferred to have given him a Reserve team run-out before bringing him back into the first team fold he could make a return against Argyle tonight.