Roy Keane says not even he would mess with Manchester City's Pep Guardiola.

The former Manchester United captain was full of praise for the Spaniard in the wake of Wednesday night's 4-0 Champions League win over Borussia Monchengladbach.

Keane highlighted Guardiola's decision to rid the likes of Joe Hart and Yaya Toure from his plans, indicating that the former Barcelona and Bayern Munich manager is a ruthless operator.

He said on ITV: "I think what was important when he first went in there, the decision to get rid of two or three really important characters from Man City – Hart, Toure – he made the decision, 'you're not for me'.

"He says he's a challenging coach and he doesn't look like he's messing about.

"They're playing with a lot of confidence, he's rotating the squad, the players are playing with a lot of confidence after a decent start.

"I wouldn't like to mess with him."