Clattenburg admits error: Madrid's first goal in 2016 UCL final was offside

Mark Clattenburg has acknowledged that he wrongfully awarded Real Madrid's opening goal in their 2016 Champions League final win over Atletico Madrid at the Stadio San Siro.

Sergio Ramos opened the scoring after a quarter of an hour, but the former Premier League referee became aware at half time that the goal shouldn't have counted.

"In that final Real Madrid went 1-0 up in the first half but the goal was slightly offside and we realised at half-time," Clattenburg wrote for the Daily Mail.

"It was a hard call and my assistant missed it."

Having realised the mistake at the break, the official wasn't shy in being open with the players once the action was underway again.

After Pepe conceded a second-half penalty, the Portuguese's protests were swiftly silenced by Clattenburg's honest response.

"I gave Atletico a penalty early in the second half when Pepe fouled Fernando Torres," he continued.

"Pepe was furious and said to me in perfect English: 'Never a penalty, Mark.' I said to him: 'Your first goal shouldn't have stood.' It shut him up.

"People might think that sounds odd, because two wrongs don't make a right and referees don't think like that, but players do.

"I knew by saying that to him it would make him more accepting of the situation.

"But he was a wind-up merchant and not fun to referee one bit, you had to be on your guard constantly."

It's fair to say that Clattenburg didn't enjoy having to referee Pepe, and that night in Milan gave a perfect example as to why that was.

"Everyone always asks about the incident in the 2016 Champions League final when I did that thing with my tongue as he was rolling around on the floor, play-acting," he said.

"In my head I was thinking: 'How soft are you for a big man?'

"He did it twice in that game, trying to get an Atletico Madrid player sent off.

"Another referee might have fallen for it but I'd done my homework and, while you should try not to pre-judge, I knew exactly what his mentality was like and I needed that knowledge to handle him.

"He was another player you just couldn't trust. A game could be easy and straightforward then he would do something sly."