Alistair Johnston has reacted after being told about a rumour about the Celtic Park dressing room that’s been doing the rounds. The Canadian right-back looks back to his best despite the defeat to Hearts on Sunday and after hearing the rumour that the dressing room is ‘disjointed’, Johnston moved quickly to put that gossip to bed. Johnston said [The Herald], “Interesting. I haven’t heard the disjointed part. The locker room is really together again. “We have got great leaders. We have got guys like Cal [Callum McGregor] and Joe [Hart] and James [Forrest] who have played in difficult run-ins an…