Chelsea stamped their authority on Group C of the Champions League on Wednesday with a brilliant 2-1 victory at Atletico Madrid.
Michy Batshuayi sent the travelling Blues fans into raptures when he arrived in the box to score a 93rd minute winner for Antonio Conte's men.
Many see the victory as one of the greatest by a Premier League side in Europe for a number of years.
The Blues were able to dismantle a team renowned for its incredible organising and defending to emerge as the first ever away victors at the Wanda Metropolitano.
It wasn't all plain sailing for the visitors, though, with Los Rojiblancos entering the break with a 1-0 lead. There was no surprises over the goal scorer either.
Antoine Griezmann broke the deadlock for Atletico against the run of play, drilling the ball home from the penalty spot.
The Chelsea man culpable proved a certain David Luiz who was penalised for dragging Lucas Hernandez to the floor from an Atletico corner.
Ultimately, Alvaro Morata and Batshuayi were able to bail out the Brazilian but the spot kick could easily have gifted Los Rojiblancos the initiative. That's not to mention the effect on the Chelsea morale in arriving so close to half-time.
And Luiz certainly felt the wrath of Roy Keane who offered a searing view of the incident during ITV's Champions League highlights show.
Obviously, there are few positives you can take from conceding a penalty but it's fair to say Keane's bewilderment far exceeded the cheapness of Luiz's foul.
"Why he's doing it is beyond me. He's lazy and he's letting his team-mates down. He knows himself. There's no need. We see a lot of that going on, so I'm glad he got punished for it. It's a form of cheating."
Chelsea fans will likely protest that Keane wasn't exactly a clean player throughout his own career, yet - albeit superlative - the criticism is ultimately fair.
Besides, it arrives in a month that already saw Luiz dismissed against Arsenal for practically wiping out Sead Kolasinac, so the 30-year-old's discipline record doesn't come to his aid.
Luiz will have to stop the moments of madness that marred his first Chelsea spell from creeping in again. Batshuayi won't be able to bail him out all the time, after all.
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