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Guardiola will return to Barcelona at the right moment - Xavi

Former Barcelona star Xavi has backed Pep Guardiola to return to the club when he feels the time is right.

Guardiola enjoyed remarkable success at Camp Nou before stepping down in 2012 and, with his Bayern Munich contract up next summer, rumours abound that he could quit the Allianz Arena.

Manchester City have been mooted as his next destination, while a role as either coach or sporting director back with Barca has also been suggested, and Xavi has little doubt his old boss will return.

"I enjoyed a very successful period with Pep at Barcelona and I know he'll choose the right moment to return to the club," Xavi, now of Al Sadd, told the club's official website.

The experienced midfielder has also once more hit out at the manner of Iker Casillas' exit from Real Madrid this summer, with the goalkeeper afforded a hastily-arranged tribute just prior to his move to Porto.

"He's a friend and one of the greatest in this sport. I'm disappointed with how he left Real Madrid, he deserved a lot better," the former Spain midfielder said.

Xavi, who moved to Qatar this summer after a trophy-laden career in Europe, went on to reiterate his stance in the debate over who is the better player between Cristiano Ronaldo and Lionel Messi.

"Cristiano is a great player but Messi is the greatest in the history of football," he said.

The 35-year-old has also spoken warmly of his brief time in Qatar so far and is determined to enjoy success with the club.

"[Former Spain and Al Sadd star] Raul only told me good things about his spell with Al Sadd. Everyone has treated me excellently," he added.

"This team is like a family, that's helped me to adapt. I've come to win trophies."