Manchester United boss Erik ten Hag has opened up following his side's nightmare 2-1 defeat to Fulham on Saturday afternoon.
The Red Devils saw Harry Maguire find the net but it wasn't enough, with Calvin Bassey and Alex Iwobi netting either side of the England international's strike to secure all three points for the visitors.
United were surprisingly flat, having previously not lost in 2024.
Their hopes of qualifying for next season's Champions League are hanging in the balance, especially after Aston Villa's 4-2 victory over Nottingham Forest.
Erik ten Hag looked dejected after Man Utd slumped to a nightmare Premier League defeat to Fulham on Saturday
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And while Ten Hag didn't name names, the Dutchman did suggest he thinks one player left the team down with poor positioning prior to Iwobi's winner.
"It was a throw-in [for Fulham] in the corner, we had them under pressure and we have one player in the wrong position," he said.
"As a team we should manage that and make sure everyone is in the right position. We let them escape and it is avoidable.
"The team showed big character to fight back, we deserved the equaliser and went for the win - we showed big personality and character.
"It was that mistake. Before that we went for the win and we should have taken our opportunities."
Maguire also discussed the result.
And the England international admitted United didn't do enough to win the game as they crashed to a 10th defeat of the season.
He said: "Overall on the balance of play we didn't do enough in the first 60 minutes or so, we started the game not great.
"The first half was pretty even, but when you're not playing at your best you have to do the basics right and set pieces is part of that.
"We knew they would cause us a threat from those areas and they've scored early in the second from what we knew - so that's disappointing on that aspect.
"To be a goal behind, I thought our reaction was brilliant especially in the last 30 minutes and when we equalised probably only one team going to win it.
"We were probably naive in the end by throwing too many bodies forward and getting done on the counter attack.
"We've been on a good run of form and came into the game we were confident."
He added: "We got hit by the injury to Rasmus, who has been big focal point for us but it is up to us to find the solutions and the areas we need to improve on.
"He has been our focal point, we can play into him, he holds it up, he starts the press really well, not only that but Marcus has been playing really well on the left.
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Alex Iwobi netted the winner as Man Utd lost a 10th Premier League match this season on a nightmare day against Fulham
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"It's the story of our season, we've been injury hit - as other teams have - and we need to find a solution quick."
As for Fulham boss Marco Silva, the Portuguese was delighted as the Cottagers won at Old Trafford for the first time since 2003.
"It is a big win for us. For sure, a great feeling for our fans, who were loud from the first to the last whistle," he stated.
"The players deserved it, clearly the best team won the game.
"We were the team which played better, created more chances and had more control of the game.
Erik ten Hag is a man under pressure in the wake of Man Utd's poor Premier League defeat to Fulham
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"It is a fantastic feeling for us to come here and win against a side in a good run of form. we knew we would have to pay at a high level; and that's what we did."
"They had two or three moments as well, they are a quality team but we controlled it very well. I'm pleased how we played at the start of the second half.
"After we scored we knew there would be a reaction. We tried to play offside for their goal but there was not the synchronisation we wanted and as they pushed, we showed the mentality which we had missed in other away games.
"It was a great counter and a great finish.
"The players deserve great credit because they understood the plan and executed the plan. It was an open game, we don't change away or at home. This is our way."