Former Manchester United goalkeeper Peter Schmeichel believes Pep Guardiola will be found wanting in the English Premier League.
Guardiola is in his first season at Manchester City and has arrived in England with an exceptional record after achieving glittering success with Barcelona and Bayern Munich.
The 45-year-old won the Champions League twice with Barca along with three league titles and was a Spanish cup winner on two occasions.
He replicated the domestic success in Germany before parting company with Munich in May to take up his post in Manchester.
Despite Guardiola being one of the most regarded coaches in football, Schmeichel has doubt about the Catalan's ability as he prepares for his first Manchester derby clash on Saturday.
"What he did with Barcelona was fantastic," said Schmeichel, who completed his career with one season at City.
"He was very lucky he had the players at Barcelona but he was clever in what he did.
"The Premier League is a completely different animal to any other in the world. It just goes on and on and on, you feel it never stops, even in March you have 12 games to go, you think will this ever stop?
"He was okay at Bayern Munich. I have to say he was okay. For me, personally, he changed a really good, entertaining team to be become more boring to watch."
Schmeichel also reckons former United manager Sir Alex Ferguson had a superior philosophy to Guardiola.
"Whereas Alex Ferguson's first priority was 'we have to be able to score goals' - for most coaches that's the priority - with Pep it's possession, I want to have as much possession as possible," Schmeichel said.
"So the philosophy goes to 'I want to have so much possession that at some point we'll score a goal from that, the goals will come from possession' and that's his philosophy."