Chelsea conceded three first-half goals against Arsenal before Noni Madueke scored his first Chelsea goal in the second-half as the Blues lost 3-1 to Arsenal.
Chelsea interim manager Frank Lampard told BBC: “Not good enough first half, that’s what confirms the result. Much better second half, but not good enough first half.
“We were too nice to play against in all aspects in the first half. In the second half we played much more like a team that has a threat up top. In the first half we were too easy to play against.
“It’s tough because you want to win games, but it’s our job, we’ll work on it.”