The 20-year old, who is on loan from Arsenal, is currently sidelined with what has been diagnosed as a hernia which was likely to keep him out for about six weeks.
Following a second operation on the problem, 'Gers boss McCoist is remaining positive and feels he could be back earlier than initially expected.
"It's a big disappointment for Kyle himself that he's out for a bit longer, but I had a good chat with him last night after his operation and he's upbeat," McCoist told the club's official website.
"He was obviously in a little bit of discomfort and a little bit of pain, but he still managed to ask me if there was any possibility we could put the Celtic game back.
"I thought that was wonderful and it just sums big Kyle up. He doesn't want to miss any training or any games. I told him I'd ask, but I didn't hold much hope it would happen for him.
"With the attitude he has and what he gives us, being without him is a big miss for ourselves, but we won't rush him back.
"When you've someone who is as eager to be part of the team as he is, in many cases that's half the battle.
"I'd hope we'd have him back in around four weeks or so, but we'll take as long as he needs to make sure he is fit again."