There were more than 20,000 inside the stadium, our largest home crowd since March 7, 2020 when 60,000 packed in to watch us beat West Ham 1-0 in the Premier League.
Though Bukayo Saka was not at his best he had moments of real quality whilst Gabriel Martinelli would still be pressing the Chelsea center backs on Tuesday afternoon if he hadn't been substituted.
With Arsenal's £24m signing Aaron Ramsdale looking on from the bench, starting goalkeeper Leno did himself a big favour by superbly denying Lukaku a second, tipping his close-range header onto the bar.
But before that, Chelsea will look to tighten their grip on a top-four spot when they host Arsenal on Wednesday.
He ended the game with more touches in his own box three than Chelsea's one.
Half time: Arsenal 0-2 Chelsea A really difficult opening 45 minutes for Arsenal's defence; Romelu Lukaku really has had them on strings.