"I've come across him many times and remember every game," McClaren said of the new Manchester United manager. "He's actually the only man I've given flowers to.
"He was with AZ while I was with Twente, they were first and we were second and they had won the league the previous week with two or three games to go.
"We had to win the game to finish second. We thought, he's won the league - we'll shower him with all good wishes and try and get him in a nicer mood and his team a little more relaxed than normal.
"So we gave a procession, congratulated them on winning the championship and in Holland you don't get bottles of champagne, you get flowers. Every time you win something, retire, they give you a bunch of flowers. So I gave Louis a bunch of flowers. We won 3-0. That got us into the Champions League."
He added: "He's a very good coach, very good manager, knows what he wants. He's done it at every club - Manchester United is the perfect fit for him."
For the big stories and the banter follow us on Twitter: @tribalfootball