According to former Red Devils defender Paul Parker, Manchester United have a “relegation midfield” and lack “heart, passion and courage”.
United have endured a difficult campaign and are seventh in the Premier League, following a 1-0 defeat to Wolves last time out.
While most of the team struggles for form this season, United’s midfield is a particular area of concern.
Bruno Fernandez, Fred and Nemanja Matic have all been criticized, while Paul Pogba and Donnie van de Beek have been superficial figures this season.
Parker insists United’s midfield options are not good enough to challenge the team at the top of the table.
“People have talked about how they saw Rangnick as a mentor, so you can look at his formation and take him to the next level,” Parker told Betfred via Metro.
“However, the problem is how can you build when the players you’ve got don’t want to give a lot or aren’t good enough to step up.
“We’ve seen it against the Wolves. Manchester United have a relegation midfield at the moment.
His comments came amid reports of unhappiness in the dressing room at Old Trafford, with 17 players currently dissatisfied with the club, the Daily Mail reported.
Parker has hit the club’s big name players who failed to show courage during the test.
“Manchester United have names but they have nothing more important than that and that is heart, passion and courage,” added Parker, who won two Premier League titles during his time at Old Trafford.
Interim head coach Rangnick has faced criticism for failing to improve results since replacing Ole Gunnar Soulsjer in November.
Former England boss Roy Hodgson, however, has backed Rangnick’s claim that he should be given enough time to put his ideas into a club with “big egos”.
“He’s a very serious football guy and he has amazing results wherever he goes,” Hodgson told Sky Sports.
“I have compassion and compassion for anyone who finds themselves on the firing line because I have been there myself.
“I think one of the problems with Ralph is that people have built him and his methods in a way that is very difficult to survive.
“Obviously in my conversations with him, it’s not a question of ‘I know something no one else in football knows.’
“He knows what it takes to build a good team and make the team play together and get the right balance between attacking and defending.
“I’m sure they are all about the players and how difficult it is to deal with the players.
“Coming to Manchester United, they will definitely come to the club, where there are so many big players, a lot of big egos and trying to get them together to get the balance they really want is never an easy task. It takes time.”
United return to home action against Aston Villa in the third round of the FA Cup on Monday, and the two sides meet again in the Premier League on Saturday.