Joe Hart is st to hang up his gloves this season after three wonderful years at Celtic. The veteran goalkeeper was pivotal in helping Callum McGregor and Ange Postecoglou lead Celtic back to becoming champions by using all his experience and leadership skills in the Parkhead dressing room. In three years at the club, Hart has picked up five trophies out of six which also included the historic record-breaking eighth domestic treble. In that time he also became only the second ever Celtic player to make a domestic clean sweep of all trophies in both England and Scotland. And the bond he has also…