Meanwhile, Chelsea FC are still believed to be on the lookout for a number of new signings this summer as the Blues look to try and build a squad capable of winning the Premier League title next season.
Manchester City were last season's runaway winners, amassing an unprecedented 100 points, 19 points ahead of nearest rivals Manchester United, 23 ahead of Spurs, 25 ahead of Liverpool and a huge 30 points ahead of fifth placed Chelsea.
But Sane believes the arrival of Sarri, who City faced twice in the Champions League last season when he was in charge of Napoli, will rejuvenate Chelsea.
'We are working on a new formation, a new style that he is asking of us.
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He can play, he's such a strong lad - such a strong player - such a fit lad, he can run, great technique as well, great ability. However, he initially travelled with the team for the club's preseason tour of the United States.
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"If you have seen how Napoli played last season, it was really, really attractive and really good".
"They might need some time to get used to his tactics but they could be a really tough team".
The midfielder's agent has also stressed that Sarri will do a good job at Chelsea and is certain that Blues fans will enjoy the kind of football their club will play under the former banker.
"I think Chelsea because they have brought a really good coach", the German winger replied when asked about City's biggest threat.
"He [Mahrez] is a great player".