Signed by Celtic in January 2022 by Ange Postecoglou, Alistair Johnston has an almost immediate impact on the success of the team. Within four short months, he was part of a Celtic team that created history as he bagged a treble, the Parkhead club’s eighth in their history, as he cemented his place in the hearts of the Hoops fans. Taking over from the popular Josip Juranovic, Johnston looked like he had been at the club for years. His aggression and combativeness made Johnston an instant Parkhead favourite with the Celtic support but not so much for his opponents. Theo Bair says Alistair Johns…