Ruben Amorim warned of the 'real challenge' he faces at Man Utd as Jamie Carragher explains why 'faith evaporated' for Erik ten Hag, Jose Mourinho & Ole Gunnar Solskjaer at Old Trafford

United's search for a permanent head coach finally ended on Friday as they announced the arrival of Amorim from Sporting CP at Old Trafford. Amorim will replace Dutch coach Erik ten Hag at the helm who spent just over two years at the Manchester club before he was sacked earlier this week.

The Portuguese coach is all set to arrive in the Premier League and take charge of a struggling United side, with the club sitting 14th in the Premier League and without a win after three Europa League matches. Red Devils fans will hope Amorim can provide an immediate boost to help rescue their season after a dismal start, but Carragher says the true test will come further down the line as he highlighted the demise of his predecessors Ten Hag, Jose Mourinho and Ole Gunnar Solksjaer.

In a column for The Telegraph, Carragher wrote: "Amorim will undoubtedly generate a short-term, feel-good factor, too. New United managers are welcomed like a breath of fresh air and there is not a lot of work needed to make the team massively improve very quickly... Amorim’s real challenge will be in 18 months’ time – just as it was for those who left Old Trafford believing they needed more time and patience to get it right.

"That is when clearer assessments will be made as to whether he is creating a side that has the consistency to actually win the title and Champions League. That is the currency United managers must deal in – the standard against which Manchester United will and must always be judged.

"Faith in Mourinho, Solskjaer and Ten Hag evaporated because after a couple of seasons each, fans and media were scrutinising the team and making what has become the cliched observation that they were still five years away from reaching Manchester City’s level.

"It will take a while before we can know if Amorim can succeed where his recent predecessors were found wanting. He is clearly a highly rated coach who has been on the radar of top clubs for a while."

Ruud van Nistelrooy will continue to manage the club on an interim basis until the young head coach arrives on November 11. United will be next seen in action on Sunday as they host Chelsea in an important Premier League fixture.