Already-qualified Liverpool ended their Europa League group campaign with an away defeat in Belgium against Union Saint-Gilloise.
Jurgen Klopp's youthful Reds side fell behind in the 32nd minute when Mohamed Amoura scored after taking the ball around goalkeeper Caoimhin Kelleher.
Twenty-year-old centre-half Jarell Quansah equalised with a powerful effort from inside the penalty area for his first Liverpool goal.
But the hosts regained the lead just before half-time thanks to Cameron Puertas' low strike, which proved to be the winner.
Puertas thought he had scored again with another well-struck shot but the goal was disallowed for handball following a video assistant referee check.
Despite the loss, Liverpool win Group E with 12 points from their six games, while Belgian league leaders Union Saint-Gilloise finished third to drop down into the Europa Conference League play-offs, in February.
Premier League leaders Liverpool will not play another European fixture until the last 16 in March and can focus on other competitions.
They now have three vital home games - Manchester United in the Premier League on Sunday, West Ham in the Carabao Cup quarter-finals on Wednesday and then Arsenal in the league on 23 December.
Match Events
16' Mohamed Amoura's shot wide out
20' CLOSE! Kelleherk denies Nilsson’s effort
23' Yellow Card! Conor Bradley booked
32' GOAL! Union Saint-Gilloise 1-0 Liverpool (Mohamed Amoura)
39' GOAL! Union Saint-Gilloise 1-1 Liverpool (Jarell Quansah)
43' GOAL! Union Saint-Gilloise 2-1 Liverpool (Cameron Puertas)
53' Yellow Card! Noah Sadiki booked
63' Handball! Cameron Puertas’ goal disallowed
88' Great save from Kelleher
Line-ups
Union Saint-Gilloise XI: Anthony Moris, Christian Burgess, Gustaf Nilsson, Alessio Castro-Montes, Koki Machida, Kevin Mac Allister, Lazare Amani, Loïc Lapoussin, Cameron Puertas, Mohamed Amoura, Noah Sadiki
Subs: Dennis Eckert Ayensa, Mathias Rasmussen, Ross Sykes, Joachim Imbrechts, Henok Teklab, Maxime Wenssens, Casper Terho, Fedde Leysen, Kevin Rodríguez, Nathan Huygevelde
Liverpool XI: W. Endo, Kelleher, Konate, Cody Gakpo, Curtis Jones, Elliott, Jarell Quansah, Conor Bradley, Kaide Gordon, Luke Chambers, Ben Doak
Subs: Joe Gomez, Tsimikas, Dominik Szoboszlai, Luis Díaz, Darwin Núñez, Marcelo Pitaluga, Gravenberch, Tom Hill, Fabian Mrozek, Calum Scanlon, James McConnell, Lewis Koumas
PEP-GUAIDIOLA
813
Liverpool's team B loose because pep is a checkbook manager
Boycalox
529
See man utd will pay for what they did not buy on Sunday
Peaceking1234
514
Liverpool lost💔😭 but we have talk this Future Gem💎 Liverpool have 🔥, What a Young Rock 🔒 , Future Star Defender🔥 for the Reds❤💪
Peaceking1234
469
Liverpool lost Today💔 so Certain Team are going to pay for it on Sunday😈😅😂😂🔥
Isaaci-zoh
428
I see someone crying because of betting
Barbara31
427
Here is the GIF, click: http://www.goalgif.xyz/v2/live/matchGifs?match_id=53698351&language=en
ishti
297
ManUtd will pay the price on Sunday for the fault of Union SG against Liverpool [Crylaugh][Crylaugh]
chukwuka29
295
to me if Manchester United team plays with Liverpool on Sunday ... if Manchester United could organize their players very well I see them winning Liverpool on Sunday no doubt.. about that I'm telling you to be honest..🤓😅😅🤷🤷🤷🤷🤷🤷
The_Alpha13
261
Liverpool has big matches coming up in EPL, why would we risk our first team players for a group we already won.
Menzaxxxxx
235
It's very unfair to pay the price of someone else sin....
jnrmax
223
Klopp: Manchester United will pay for this!
ishti
187
Liverpool getting ready for ManUtd after this upset against Union SG 😭
Schlembeckler
165
Stunned? We played our youth squad. Who cares?
PrinceAbobyBlinkz
92
Winning with a bunch of Young stars is not for everyone, only Man City can do that. Barcelona tried it yesterday but failed