Maurizio Sarri believes Chelsea are one year behind Liverpool.

The Blues ended their winning streak to start the season with a goalless draw against West Ham United on Sunday.

They are now two points behind the Reds, and manager Sarri believes it will take more time for his team to become true title contenders.

"We have to face a team, a very, very good team that has worked with the same coach four or five years, I don't know exactly," Sarri said in his post-match news conference.

"They are a step forward than us at the moment. We started to work together 40 days ago and [have had] less time with the international [break].

"For us it is a bit early. We have to work and improve and then maybe in a year it will be the same level as Liverpool."