McGregor was given a second chance by then manager Walter Smith in 2009 and yesterday revealed he had signed a new six-year deal with the Clydesdale Bank Premier League champions.

McGregor and team-mate Barry Ferguson had been caught making V-signs on camera and were also accused of all-night drinking at a hotel while on duty with Scotland.

Ferguson left for Birmingham but Smith gave McGregor a second chance.

"I was glad to get back in the team at the start of the following season and I was obviously grateful to Walter for that," said McGregor.

"But those first few weeks after what happened were difficult.

"As soon as I came back to training I got my head down and worked away.

"Whatever's happened I've always been focused at training and playing."

McGregor added in the Scottish Sun: "It was a big change from when he pulled me in immediately after the Scotland game - when I saw a scary side to him.

"Obviously you listen to him. He has been there, done it and worn the T-shirt when it comes to management. I respected him and what he said and took it on board."