Chelsea ace Willian has fired a title warning at Premier League leaders Manchester United and Manchester City.

Willian insists both Manchester clubs will hit a blip soon.

"They (United and City) start very well, but sometimes in football it is not important the way you start, it is important the way you finish because last season we started not to well, and then we arrive there," he told Sky Sports.

"So it is important to always be ready for everything."