Liverpool manager Arne Slot admitted the 3–2 defeat to Manchester United on Sunday exposed the two dominant strands of his team’s season: contentious refereeing decisions and a handful of “stupid” mistakes from his players. He challenged one pivotal decision but also accepted his side’s sloppy play gave the moment its opportunity.

“If it was a touch, which I think it is, because if you know a bit about ball sports, you know that if a ball has a certain curve and the curve changes, there must have been a contact,” Slot said. He added: “But if it’s light then we should have a debate in football about whether that’s enough to disallow a goal. But the rule is if there was a touch then it should have been disallowed.”

Slot insisted the pattern of contentious decisions has been a recurring theme this season. “I don’t think it’s a surprise to anyone this season that if there’s a VAR intervention or if there’s something that could be left or could be right then the decision goes against us. That has been the whole season every single time this season. I remember Paris Saint-Germain at home , getting a penalty for a soft touch on [Alexis] Mac Allister but of course the VAR intervenes and says, ‘No, no, no, this is not a penalty.’ Then one week later when I see Paris Saint-Germain play against Bayern Munich and get that same soft touch but the penalty stays.”

He contrasted incidents in which play was not stopped for injury with others where it was, and stressed self-examination. “We have to first look at ourselves, that is completely clear and obvious, but that decisions have gone every single game against us, that’s also completely clear and obvious.”

Slot noted moments of poor concentration and a turnover that led to the second goal: “we lost the ball in a stupid position and we lost a few big moments afterwards in duels.” The club appears settled on his future: his position is understood to be safe and Liverpool are keeping last season’s title in view. With Champions League qualification largely secure — six points clear with three games left — Slot must now map out how to correct the recurring faults exposed this campaign.

Alexander Isak’s first months on Merseyside have been disrupted by injury and interrupted preparation. A disrupted preseason and a broken leg have prevented the striker enjoying a smooth debut campaign after his rise at St. James’ Park. He only recently returned from that major leg injury and, after a few sluggish outings, had appeared to be finding momentum again.

Isak scored his first Premier League goal at Anfield since he donned Saudi green for the Magpies, but he has suffered a fresh groin problem in training. The first reports of the issue emerged on Saturday and the knock was enough to rule him out of Sunday’s clash at Old Trafford. That absence followed a significant injury sustained at Tottenham Hotspur before Christmas, which ruled him out for the best part of four months.

Arne Slot spoke to Sky Sports before kick-off to outline the immediate impact on his squad and to express his frustration. He said: “After our last win against Palace, you go into the week and in the start you already know you’re going to miss out on Mo [Salah], and then during the week we miss out on Alex as well.

“But that’s not the first time this season. Arsenal away, we had our both No. 9s not available as well and we were able to play a good game. So, it is the situation to accept it.

“Of course, very unlucky and unhappy with the fact Alex picked up a small—really small—injury,” Slot fretted. “That’s why this game came a bit too early.”

Reports underline that the latest problem is not on the scale of his broken leg, and Slot has been optimistic about a swift recovery for his costly recruit. Isak had dealt with a few nagging issues at Newcastle, and those problems have not ceased since his move. Despite the setback and with just three Premier League games remaining, these comments suggest Isak’s season may still continue.

Alexander Isak was ruled out of Sunday’s derby against Manchester United with a groin injury, prolonging a difficult debut campaign at Liverpool. Isak had been eased into first-team action during his first three months at the club before suffering a broken fibula against Tottenham Hotspur in December. He did not make another appearance until April and had started to regain form, scoring a well-taken goal against Crystal Palace last weekend, but that momentum was halted.

Arne Slot named a 4-2-3-1 for the trip to Old Trafford: Freddie Woodman; Curtis Jones, Ibrahima Konaté, Virgil van Dijk, Andy Robertson; Alexis Mac Allister, Ryan Gravenberch; Jeremie Frimpong, Dominik Szoboszlai, Florian Wirtz; Cody Gakpo.

Substitutes: Armin Pecsi (GK), Joe Gomez, Milos Kerkez, Federico Chiesa, Trey Nyoni, Kieran Morrison, Rio Ngumoha, Mor Talla Ndiaye, Will Wright.

With Hugo Ekitiké and Mohamed Salah also sidelined, Slot again adjusted his selection. Curtis Jones, Dominik Szoboszlai and Jeremie Frimpong are all capable of filling the right-back role for Liverpool, while Szoboszlai and Frimpong have also been used further up the right flank. Cody Gakpo is expected to resume an unloved central striking role, though Slot could deploy Florian Wirtz and Dominik Szoboszlai in a dual-false-nine setup he used sporadically last season.

First-choice goalkeeper Alisson did not overcome his fitness issue for the trip, and with Giorgi Mamardashvili also unavailable, Freddie Woodman started in goal once more.

At this late stage of the season a relatively minor muscle strain can end a campaign, and with a World Cup on the horizon there is added incentive for players and staff to take a cautious approach to rehabilitation and recovery.