Nunez struggled to make an impression against UnitedCredit: Getty

It meant that Arsenal stay top of the Premier League after leapfrogging the Reds earlier in the day.

Nunez has been struggling for form this season in the league where he has just four goals – with his last strike coming against Nottingham Forest two months ago.

Speaking to talkSPORT, ex-Liverpool star Hamann has admitted that the Uruguay international is becoming a worry.

He said: “I do like Endo, I saw a lot of him in Germany and he scored a good goal a couple of weeks ago so I thought he is adapting to the pace of the Premier League.

“Szoboszlai had a good start to the season but has gone a bit quiet now. Gravenberch is a capable player.

“I think they are missing Alexis Mac Allister, he is probably the best midfielder so far.

“But I think the big issue is the form of Nunez.

“Since he scored them goals away to Newcastle I thought he had come into his own now and be the striker that everyone expected him to be.

Nunez has not been firing in front of goal this season

Hamann has admitted he is worried over Nunez’s form

“I think he has scored only one or two goals and his form is a bit of a worry.”

Liverpool are still one of the favourites to go on and win the title this year in what could be the most open Premier League battle in years.

Having won the last three titles, Manchester City have seen their levels drop – but can never be ruled out due to their squad strength.

Nunez was taken off against United when Liverpool needed a goal Credit: Getty

But they sit below Liverpool, Arsenal and Aston Villa in the table while Tottenham are a point behind.

However, Jurgen Klopp will need Nunez to start firing again soon after investing so much in him.

In 66 appearances for Liverpool, the former Benfica star has netted 22 times but has been asked to do more to take the Reds to the next level.

Against United, Nunez even infuriated Jamie Carragher on Sky Sports commentary after failing to follow up Luis Diaz’s shot.

And he was close to a red card, which infuriated United fans after Diogo Dalot was sent off for a similar offence.

Liverpool continue to be reliant on Mohamed Salah for goals, having scored 11 already this season.

Salah has 11 of Liverpool’s 36 Premier League goals this season Credit: AFP

Hamann added: “When they were successful, [Sadio] Mane scored the goals, [Roberto] Firmino scored a few and they complimented each other.

“At the moment it looks like when Salah doesn’t score they don’t score. For the last few weeks they’ve been fortunate. They were fortunate enough to draw with Man City, they got away with it against Palace and Fulham.

“Yesterday was the first time they felt they didn’t win when they should have done. Salah is the standout player and needs someone else to take responsibility.

“Diaz is not really firing, and Nunez scores every now and then, which is not enough.”