Barcelona coach Ernesto Valverde has hit out at Manchester City boss Pep Guardiola.

Valverde is angry Guardiola made a personal approach to Ajax midfielder Frenkie de Jong before he committed to a Barca deal.

"Talking to a player who is under contract with another team is something that can't be done," he told reporters.

"You can't talk to a player who is under contract and that's something that isn't in my personal code but suffice to say, everyone has their own way of acting.

"Everything depends on the performance that De Jong gives in the future and he'll need to adapt despite coming in from a club with a similar philosophy to us at Barcelona.

"He's young and the club has to look at that but we are incorporating players who are enriching the game and can be important for us."