City reached the semi-final of Europe's elite club competition for the first time this season but were knocked out of the tournament by 10-time winners Real Madrid.
"It's a big opportunity for him at Manchester City. I think he will change the face of English football," Xavi, who joined Qatari club Al Sadd in May last year, told the website for Qatar's Supreme Committee for Delivery & Legacy (www.sc.qa).
"If there is anyone capable of changing that mentality, it is Guardiola... He is without doubt one of the best coaches in the world at the moment."
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
Guardiola achieved a double in his final season in Germany, with Bayern winning the Bundesliga and beating Borussia Dortmund on penalties to win the German Cup in his last game in charge.
(Reporting by Ian Rodricks in Bengaluru; Editing by John O'Brien)
