New Blues coach Thomas Tuchel sent a message to Chelsea players ahead of the weekend Premier League clash with Manchester United at Stamford Bridge after Atletico Madrid.
The West London outfit put in an impressive display as former Arsenal Olivier Giroud's overhead kick handed them a 1-0 win over Atletico Madrid in their Champions League last-16 first-leg encounter at Arena Nationala in Bucharest, Romania on Tuesday.
Tuchel will lead Chelsea to nine games in charge without a defeat since arriving at Stamford Bridge on 26 January after he replaces club legend, Frank Lampard.
But former PSG manager says they "cannot get comfortable or get lazy" ahead of a crucial four-game stretch in their top-four ambitions as told BT Sport.
"Honestly, we now play Manchester United, Liverpool, Everton and Leeds but this is good. We cannot get comfortable or get lazy."
Chelsea face a tough battle with Manchester United on Sunday before taking on Liverpool, Everton, Leeds United and Atletico Madrid in their next five games.