Chelsea manager Maurizio Sarri says his side are “a step behind” Premier League leaders Liverpool, who they face twice in the next week.
Chelsea go to Anfield in the Carabao Cup on Wednesday, before a league meeting at Stamford Bridge on Saturday.
“They have worked with the same coach for four years,” said Sarri after the Blues dropped their first points of the season in Sunday’s 0-0 draw at West Ham.
“I think Liverpool are ahead of us.”
Manager Jurgen Klopp took charge of the Reds in October 2015, succeeding the sacked Brendan Rodgers with the team 10th in the league.
The German guided them to an eighth-place finish that season, as well as the League Cup and Europa League finals, before making the top four in his next two campaigns.
Liverpool reached last season’s Champions League final – losing 3-1 to Real Madrid in Kiev – and the Reds are two points clear at the top of the Premier League this term after winning all six matches.