“When I was leaving, there was one sign I remember which hung as you walked out of the building and it read: Have you been better today?
“That is a culture which I tried to build when I was in Celtic. To build a professionalism 24/7 and to be better each day in everything they do.
“I felt the club went a lot forward in that aspect in my two years, getting people to reflect more on what they are doing and be more-conscious about everything they do on and off the field.
“Brendan has taken it even further and he is a fantastic manager.
“In fact, I think he’s the very best British manager. He could be the manager of anyone now.
“That season as a runner-up with Liverpool in the Premier League was just fantastic and he’s the best British coach around.
“When he succeeds with Celtic, I feel happy. And I feel happy that I meant something for the culture for a lot of the players he has now.”