Leroy Sane has tipped Chelsea to pose the biggest threat to Manchester City's Premier League title defence next season.
The Blues finished fifth last season, outside the Champions League places and 30 points adrift of Pep Guardiola's runaway champions.
Chelsea have also had a chaotic summer, with the sacking of manager Antonio Conte not confirmed until after the start of pre-season training.
Maurizio Sarri has succeeded Conte, and Sane saw enough from two matches against his Napoli side last season to think he will have a positive impact.
"I think Chelsea [will be the biggest threat to Man City] because they have brought a really good coach," the Germany international told Sky Sports.
"If you have seen how Napoli played last season, it was really, really attractive and really good. We really suffered against them.
"They will need some time to get really used to his tactics. They could be really tough. Also Liverpool too - they bought really good players. They could be really strong next season."