Overnight, the news that Celtic defender Alistair Johnston had exited the international match between Canada and the United States due to a hamstring issue sparked fears of a significant injury. Johnston was substituted off after just 25 minutes in Canada’s win over their continental rivals, albeit under his own power and apparently not in much pain. The right-back has been in excellent form for Celtic at the start of the 2024/25 season, and the thought of him sitting on the sidelines for an extended period is a worry. Anthony Ralston provides backup but can’t perform at the level the Canadian…