He said: “I know Craig Gordon well and I was delighted to see him back starting for Scotland in midweek. He had those issues with his knee and he was thinking about retiring. So, to get back into football and then reach the level he is at is phenomenal.
“The only issue was his knee. If he got that cleared up there was never any doubt he was going to be a top goalkeeper again. And it’s great to see he has done that.
“I saw Craig saying he has played 100 games now since his injury, which is great. Maybe even he didn’t even see that happening.
“I could definitely see him becoming Scotland No1 again. When you are playing for Celtic, taking part in the Champions League and winning trophies, then I don’ t see why not.
“In my opinion, Craig is still a world-class goalkeeper.
“I actually spoke to him before he went to Celtic because I knew he was looking for a club and he was a player I would have been delighted to get.
“But he had the opportunity to go to Celtic and he wanted to go there, which I understood. It was a chance to play Champions League football.
“It will be tight and if Aberdeen are going to win it then they’ll need a little bit of luck. They’ll need to really perform at the top of their game from now until the end of the season.
“But with Celtic’s budget they have about 15 players from midfield to attack that they can pick from. They’ve got great resources to win games.”