Alexander Isak had to wait over two weeks after signing for Liverpool to make his debut for the club, and his first appearance came under the lights at Anfield.
The Sweden international was a somewhat surprise starter, given his lack of a proper pre-season and refusal to play for Newcastle at the beginning of the campaign, but Arne Slot felt as though he was ready to make his bow.
A Champions League game against a Spanish giant is a fitting platform for a debut for a Premier League-record signing, and here are three things we picked out from his debut...
Heart in mouth moment
The main reason Isak did not figure against Burnley on Sunday is that Arne Slot wants to manage his new signing carefully to minimize the chance of him picking up an injury due to overload.
Isak had not started a game since the final game of last season, so it was somewhat surprising to see his name in the line-up against Atletico.
Despite Slot's sensible caution, injuries can happen to anybody at any point, and it was a worry when he went down and writhed in pain after a crunching challenge by Robin Le Normand.
Le Normand's studs were planted firmly on the top of Isak's' right foot, and the challenge earned the Atletico defender a booking. Thankfully, after receiving treatment, Isak was back on his feet and was OK to continue.
Glimpses of quality
Despite Liverpool taking an early two-goal lead, Isak was not involved too much at the start of the game, but there were a few glimpses of quality toward the end of the first half.
The Swede's first shot at goal had very little backlift, and although the effort traveled wide of Jan Oblak's goal, the speed with which he manoeuvred the opening was mightily impressive.
The technique drew a comparison with Robbie Fowler by Darren Fletcher, the lead commentator for UK's Champions League broadcaster, only with the caveat: "Robbie would have hit the target."
A lovely through ball to Florian Wirtz followed, and although the German rounded the goalkeeper, he never quite had the ball under control in order to apply the finishing touches which would have seen Isak claim an assist on his debut.
Quieter after the break
If it was surprising to see Isak's name on the teamsheet, it was also somewhat surprising to see him last almost an hour before he was replaced by Hugo Ekitike.
Perhaps the way he grew into the first half convinced Slot to keep him on the field, or perhaps it was always the Dutchman's plan to give him almost an hour, but there was nothing of note from the 25-year-old after the break.
Next up for Liverpool is the Merseyside derby on Saturday. That's the early kick-off, so it will interesting to see what part — if any — Isak plays against the Toffees, considering the extremely short turnaround between games.