Sir Alex Ferguson expects Pep Guardiola will struggle to emulate the dominance he enjoyed in charge of Barcelona when he takes over at Manchester City next season.
The Manchester United legend has conceded his former Premier League rivals have done well to capture one of the best managers in world football ahead of his former club.
However, although the 74-year-old admires Guardiola’s determination and managerial style, he believes it takes more than graft alone to succeed in the English top-flight.
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"Without question Pep has got a fantastic work ethic about him, he demands that from all of his training sessions," he told Sky Sports.
"Anyone who thinks they're not going to work hard at City won't last long. He has got great coaching ability, there is no doubt about that.”
Having won 13 league titles during his 27-year career at Old Trafford, Ferguson knows better than anybody what it takes to top the pile in an increasingly competitive division.
Ferguson insists the appointment of the current Bayern Munich boss is far from an assurance City will stroll to the title next season due to the unique demands of the Premier League.
"Man City have made a real coup in getting him but Pep won't find it easy, English football is not easy.
"Every foreign coach that has come to England will tell you that. Arsene Wenger was talking about that a few months after coming and even Jose Mourinho was.”
Ferguson believes the competitiveness of the English top-flight will not suffer from the arrival of Guardiola, rather he expects the other title contenders will react to ensure they are capable of mounting their own bid for the trophy.
"If you take my time at United, when Chelsea and Jose came on the scene, in the first two years they had quick starts, so I had to accept that challenge.
"That's what you have to do when you're a big club. Arsenal, Liverpool and the other clubs have to accept the challenge when they are not good enough.
"They'll have their own ambitions and will be desperate to win the league next season as much as City, so Pep there is not a guarantee they can win the league.
"That's the beauty of our league. Arsenal, City, Liverpool, Chelsea, Tottenham will want to do something and now, of course, Leicester City are there. Who's to say they can't win it next season?"
With 14 major honours to his name during an illustrious five-year spell at the Nou Camp, Guardiola has a daunting task ahead of him if he is aiming to break his own records.
The Spaniard is expected to bring in a host of recruits when he takes over from Manuel Pellegrini at the Etihad during the summer, but Ferguson is convinced he stands little chance of matching his achievements with the Catalan superpower.
"Pep will be a success but I don't think he'll ever replicate what he did at Barcelona because that was a high standard - they were the best,” he said.
According to El Confidencial, Guardiola has already set his sights on landing highly rated Arsenal star Hector Bellerin, presumably to replace the ageing Pablo Zabaleta and Bacary Sagna.
Arsene Wenger is unlikely to consider offers of any size for his first-choice right-back, but City never fail to surprise when it comes to using financial muscle to their advantage.
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