Manchester United need to make more than "minor amendments" to fix the glaring issues at the club, according to Ralf Rangnick.
United were thrashed 4-0 by old foes Liverpool on Tuesday, and face a huge game in their hopes of securing Champions League football when they take on Arsenal on Saturday.
The match in north London comes two days after United officially confirmed Erik ten Hag as their new boss, though the Ajax coach will not join until the end of the season.
It leaves interim manager Rangnick with five games to salvage a top-four finish from another underwhelming season.
Rangnick is unsure if he will be staying on in a consultancy role at Old Trafford, but he believes the problems at the club are obvious.
"You don't even need glasses to see and analyse where the problems are," Rangnick told a news conference.
"Now it's about how do we solve them? It's not enough to do some minor amendments or cosmetic things.
"In medicine, you would say that this is an operation of the open heart.
"If this happens and everyone has realised that this has to happen and if people want to work together then it makes sense and I believe it doesn't take two or three years to change those things. This can happen within one year."
Rangnick hinted that Ten Hag, however, will need assistance in enacting these changes if they are to be successful.
"For sure [strong leadership is needed]. This is something that not just one single person as a manager can do," he continued.
"With all respect to [Liverpool manager] Jurgen [Klopp] and [Manchester City boss] Pep [Guardiola], I'm sure that they didn't do all the things themselves.
"There were also other people involved in those two clubs, people in certain positions, no matter what area it was, in order to rebuild and build something we want to build here. In all areas you have to have top people and they have to work together in a very close, reliable way."
Asked if he wanted to stay on at United, Rangnick replied: "I still see where we could develop.
"We have perfect training conditions, a great stadium, massive fan support, probably the best I’ve ever experienced apart from Schalke. Of course I would want to be part of the process that has to happen."
Man Utd set to face Galatasaray in Champions League despite bad weather
Manchester United’s match at Galatasaray is set to go ahead after bad weather throughout the day in Istanbul had put the Champions League clash in doubt.
Relentless rain has been falling in the Turkish city throughout the day and there are concerns over the state of the pitch at Rams Park.
A statement from UEFA said: “We are closely monitoring the weather forecast and at this time the match will go ahead as scheduled.”
United and Galatasaray arrived as planned, beginning their warm-ups as scheduled.
Erik ten Hag’s men go into the match bottom of Group A having lost three of their four games so far in this season’s competition, and without a win away to Galatasaray in their last three visits.
Galatasaray twice came from behind to win 3-2 when the sides met at Old Trafford in October, with Mauro Icardi scoring an 81st-minute winner after United midfielder Casemiro had been sent off.
Bad weather puts Man Utd’s Champions League match at Galatasaray in doubt
Manchester United’s Champions League match at Galatasaray is under threat from bad weather in Istanbul.
Heavy rain has been falling in the city throughout the day and there are concerns over the state of the pitch at Rams Park.
A statement from UEFA said: “We are closely monitoring the weather forecast and at this time the match will go ahead as scheduled.”
United go into the match bottom of Group A having lost three of their four games so far in this season’s competition, and without a win away to Galatasaray in their last three visits.
Galatasaray twice came from behind to win 3-2 when the sides met at Old Trafford in October, with Mauro Icardi scoring an 81st-minute winner after United midfielder Casemiro had been sent off.
VAR may have to go amid Premier League, Champions League controversies, says Anderton
VAR will have to be removed from football if officials cannot find ways to use the technology more effectively, says former England midfielder Darren Anderton.
The use of video assistant referees has come under the spotlight this season, with a series of high-profile errors marring games in the Premier League and across Europe.
In September, Luis Diaz was incorrectly denied a goal in Liverpool's loss to Tottenham due to a "significant human error" which refereeing body Professional Game Match Officials Limited (PGMOL) subsequently apologised for.
Meanwhile, Mikel Arteta made headlines when he described the decision to allow Newcastle United's winning goal against Arsenal as a "disgrace", while Wolves boss Gary O'Neil said he had "finally turned against VAR" on Monday after Fulham were awarded two highly contentious penalties against his team.
There was also controversy in the Champions League on Tuesday as Newcastle's Tino Livramento was harshly penalised for handball, allowing Kylian Mbappe to score a stoppage-time equaliser from the spot as Paris Saint-Germain rescued a 1-1 draw against the Magpies.
While Anderton believes VAR was brought in for the right reasons, he cited frustrating delays after goals and repeated mistakes as reasons why many wish to see the back of it.
"I would have [liked VAR] in the FA Cup semi-final in 1993 when I got brought down!" Anderton, who was part of a Tottenham side beaten by Arsenal on that occasion, told Stats Perform.
"I think it's a good thing and the idea of it is good, to make the right decisions, but it's not happening and that's a problem.
"There is nothing better than scoring a goal and you should be able to celebrate it and not worry that it's going to be chalked off.
"I feel like it's almost at a point now that whenever there's a goal scored, you're looking for something for it to be ruled out. I think that's sad.
"I think that's sad for players to have to be that way because the adrenaline of scoring a goal in a Premier League game or for your country... there is no better feeling.
"If it's taken away, it's taken away, but when you've got to stand there for three minutes, four minutes, you've got to be able to celebrate those moments. They're what you play the game for.
"So unless it gets better, they're going to have to get rid of it, and that's wrong, because you do want the right decisions in football games."
While the International Football Association Board (IFAB) has been discussing expanding VAR's remit to include other incidents such as yellow cards and corners, Anderton has a different idea.
He suggested VAR should be part of a challenge system similar to that used in the NFL, saying: "I don't know whether you just go to a point where now, like in American football, managers get a challenge.
"You get two or three challenges in the match so it doesn't become a hundred-minute football match. It's pretty crazy, and it's frustrating to watch. I'm with everyone on that."
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