The striker has found form since coming back from loan,scoring twice at home to Derby whom he was loaned to and away at Preston and Hull City, has now picked up five cautions and will miss Saturday's trip to Watford.
John said: "I am really disappointed with the referee's decision. I thought it was a clear foul because I put the ball through his legs and tried to get round him. "So this kills me for Saturday's game at Watford which is disappointing because I feel I am flying these days and I just want to keep playing."