Johnson was stretchered off early in the second half of yesterday's 2-1 win at Blackburn with a knee injury, however Gray commented: "I think he is going to be okay."
Gray will also check on the fitness of goalkeeper Paul Robinson, who played at Ewood Park despite missing the previous few days’ training with a stomach bug, as well as that of Didier Domi who missed the Rovers game with a groin strain.