From Brentford Community Stadium - Chelsea returned to the top of the Premier League with an uninspiring 1-0 win at west London rivals Brentford.
Thomas Tuchel's side created very little and were fortunate that the hosts only big chances came late on.
The first notable moment of the game went Brentford's way when Bryan Mbeumo hit the post, before Chelsea went down the other end on the counter and Romelu Lukaku put the ball in the net - but the Belgian was offside and the goal was ruled out.
Mateo Kovacic had a free-kick deflected just over the top of David Raya's net, while Mbeumo's cross-cum-shot was safely held by Edouard Mendy.
Chelsea took the lead on the stroke of half-time through Ben Chilwell. Brentford failed to deal with a cross and the England international was on hand to rifle the ball into the top corner.
