Maurizio Sarri is unsure why his Chelsea side are starting slowly in matches, after the Blues were held to a 0-0 draw by Everton.
Everton were hardly tested in the first half at Stamford Bridge, with Chelsea unable to muster a shot on target until Marcos Alonso forced Jordan Pickford into action with a rasping volley.
Pickford was more involved in the second half, pulling off a string of fine saves to deny Alvaro Morata – who also had a goal disallowed – and Eden Hazard, while Alonso hit the woodwork.
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And Sarri, who has become the first manager to have gone unbeaten in the first 12 Premier League games, has acknowledged that Chelsea's persistently sluggish starts are a concern.