While the debate about who the greatest footballer of all time is rages on, Liverpool star Andrew Robertson star has no doubts that title belongs to FC Barcelona superstar Lionel Messi.
Robertson was involved with a brief altercation with the six-time Ballon d'Or winner during the Reds' UEFA Champions League semi-final triumph last season, and has since revealed that he regrets disrespecting a player he regards as the greatest of all time.
"I sometimes play as a fan and not as a professional footballer, which is maybe my downfall at times," Robertson said, as reported by the BBC.
"Me and Fabinho were tracking Messi back and we both ended up on the ground and I just ruffled his hair a bit. He wasn't too happy and it's something I wouldn't do again, that's for sure!
"It's disrespectful to the best player who's ever played the game. That match, I've never seen a changing room so pumped up. I don't know what came over me.
"I do regret it but it's something everyone always mentions to me. I wasn't thinking! In the Nou Camp, in the first leg, I thought I dealt with him as well as I could have but he still walked off with two goals in a 3-0 win and all everyone is talking about is Messi.
"He's the best player ever to play the game, in my opinion. There was a moment when he knocked it by two of our midfielders in the first few minutes at the Nou Camp and he was running directly at me and I was thinking 'oh right, this guy's serious, he's coming at me now'.
"The stuff he does with his feet is just frightening. You can't see, you need to guess at times to defend against him."