Everton 2-0 Chelsea: Second-half display 'worries' Maurizio Sarri

Chelsea manager Maurizio Sarri says he "can't explain" and is "worried" by their second-half performance in the 2-0 loss to Everton at Goodison Park.

MATCH REPORT: Everton 2-0 Chelsea

Watch highlights of Sunday's Premier League games on Match of the Day 2 from 22:30 GMT on BBC One and on the BBC Sport website.