With Scotland’s exit from Euro 2024 effectively ending Celtic fan interest in international football, it was kind of easy to forget that Alistair Johnston still had unfinished business in the Copa America this summer. The Celtic defender has been a stand-out in the tournament and has helped Canada create history in the tournament this summer. Johnston booked his place in the semi-finals after a win against Venezuela teed up a tie against Lionel Messi’s Argentina. With hopes high of booking a place in the final against Uruguay, Johnston and his Canadian teammates crashed out after goals from Ju…