Manchester City boss Pep Guardiola has declared Barcelona star Lionel Messi as untouchable.

Guardiola admits he loved working with Messi while Barca coach.

He said on Christian Vieri's Twitch stream: “He's very strong, the strongest.

"Beyond his quality, there is his mentality, his head.

"In four years at Barcelona, we have played a lot in training and we haven't lost a single one. If he had lost, he would have left. He has this competitive mentality, there are four or five players in history who have something different."