Gary Rose
BBC Sport journalist
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The main intrigue after the teams had been announced before Wednesday's game was just how Liverpool would gel with both Hugo Ekitike and Alexander Isak in the starting line-up.
Up until now, Arne Slot has preferred to rotate the two but this was the first time Liverpool fans got to see how they played alongside each other from the outset.
So just how did the Reds line up?
BBC Sport's football tactics correspondent Umir Irfan said: "Slot altered his approach against Frankfurt and, in the end, it paid off.
"Liverpool played in a 4-4-2 shape out of possession throughout the game - which isn't uncommon for his teams - with Florian Wirtz defending as a right midfielder.
"In possession, they played with a slightly fluid 3-2-5 shape. Cody Gakpo and first Jeremie Frimpong, then Conor Bradley held width on the left and right flank respectively.
"Isak played inside, slightly towards the left, Wirtz playing inside towards the right side and Ekitike down the middle. However, these three rotated between themselves.
"Defensively, Liverpool still looked open at times and the more attacking midfield trio, paired with Slot's rotation-heavy approach, left gaps down the middle.
"In possession, however, this was a display full of bright performances and budding relationships that may inform how Slot looks to get this Liverpool side in good form, perhaps at the expense of some of their more established names."
"This might be a long-term system for Slot, but time will tell on that," former Liverpool full-back Stephen Warnock told BBC Sport.
He added: "There is always going to be little flaws in a new system - it's not going to be flawless straight away.
"Away from home as well, it is difficult to adapt at the start of a game, but they soon took control and were comfortable in the way they played."
While the Isak-Ekitike partnership lasted just 45 minutes, some of those watching are enthused by the prospect of them playing more games together.
"I like it," former Manchester United striker Andy Cole told BBC Sport. "They are both of a good age, bought for the future.
"I can see them playing as a two, because if they do they it will ultimately cause chaos. They both have the pace, ability and are prepared to take players on."
Read the full breakdown of Liverpool's return to winning ways