Chelsea have won all of their last six matches in all competitions.
The Blues have looked unfazed despite the ongoing issues surrounding the ownership of the club.
Brentford also head into the fixture having lost eight of their last 11 matches.
Havertz has scored four goals in his last three league appearances.
The forward also netted for Germany during the international break.
The German's form has seen him take Lukaku's spot in the starting line-up.
Match preview: Chelsea vs Brentford
Chelsea have now won six games in a row since their Carabao Cup final defeat.
The Blues are 3rd in the table, into the Champions League quarter-finals and are in the FA Cup semi-finals.
Thomas Tuchel and his players have managed to remain focused despite the distractions over the ownership of the club.
The west Londoners just edged past Newcastle in their last outing as Kai Havertz scored the only goal of the game.
Brentford move eight points clear of drop zone
Brentford have moved eight points clear of the bottom three.
Their last outing saw them beaten by Leicester City 2-1.
However, back to back wins over Norwich and Burnley have boosted their hopes of survival.
The Bees have some tough games on the horizon as they face West Ham, Spurs and Man United in their next four games.
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