#4 Mo Salah's absence in another big game
There have been only two "big" games this season that Mo Salah has scored in - the home game against Napoli in the Champions League, and against Arsenal in the Premier League. The goal against Arsenal was a penalty, mind you.
So, is there something that should concern Jurgen Klopp? Surely, it must, right? His talismanic goalscorer is just not coming up with the goods in the games that matter.
He has been shuttled between being the central striker and the right winger this season, but in this game, Salah could never really get the better of Luke Shaw, even though he found himself isolated with the Manchester United left-back on a fair few occasions.
It's clear that Salah doesn't exactly enjoy playing against teams that sit deep in a low block, as it deprives him of the ability to run in behind and use his pace in the space. His dribbling was nothing short of dreadful in this game, and he wasn't any better in any of the other aspects either.
Sure, it didn't help him that Firmino went off, depriving him of the telepathic understanding that he thrives on, but Salah didn't help himself, as he failed to get the basics right.
Salah's overall record this season still is stellar, but the longer this patchy run against the big sides goes on, the more glaring the concern will be for Jurgen Klopp.