Rangers could face an injury sweat over Connor Barron as he has withdrawn from Scotland under-21s’ next game. The young midfielder, 22, has proved a smart pick-up after his Aberdeen contract expired even if it is yet to be decided by a tribunal what fee is to be paid. Barron has settled into Ibrox life well and appears to be one of Philippe Clement’s preferred options in the centre of the park, usually alongside Mo Diomande. He perhaps didn’t have the best of times in the derby, but other than that his performances in a blue shirt have been largely encouraging. Still young, he can grow into th…