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Chelsea came from behind to beat Arsenal 2-1 at the Emirates thanks to late goals from Jorginho and Tammy Abraham.
The Blues were 1-0 behind at halftime and deserved the victory over Arsenal after a superb second half display.
Revealing what he told the players that triggered the Arsenal comeback win, Chelsea boss Frank Lampard told BBC Sport: “From my point of view you can accept a miss-pass but you can’t accept lethargy in a London derby.
“The players were told that and they delivered. The second half was nothing to do with tactics it was all to do with spirit and desire.
“I still haven’t bounced back from Boxing Day mentally (loss to Southampton).
“Our next home games we’ll do everything we can to turn the corner.
“We’re still in fourth and want more and the home games have been different so we have to focus on them when they come around.”