Roy Keane has claimed Manchester United’s “obsession of protecting the back four” has stopped them being “creative” in midfield.
The Red Devils are looking to make it five games unbeaten when they host rivals Arsenal.
While they have only conceded two goals, they have only converted a few of their chances on goal.
And Keane, who won seven Premier League titles at United as well as a treble in 1999, believes they defensive capability is part of the problem.
Speaking to Sky Sports , the former United midfielder said: “There's an obsession at the moment of protecting the back four, but United lack creativity going forward.
“[Bruno] Fernandes has been brilliant, obviously [Donny] Van de Beek hasn't had a look in.
“I’d like to see him [Van de Beek] there. Why not? I've seen [Scott] McTominay in there, players like Fred, [Nemanja] Matic.
“I’m not on about when they're competing with teams in the middle of the table, they need to be competing against the likes of Liverpool and Man City.
“When you talk about energy, the amount of arguments I had playing in midfield with centre halves. Everyone is obsessed with protecting your back four. United need a bit more than that."
The Irishman went on to single out one player for not providing enough on the pitch at Old Trafford.
Keane added: “We talk about energy but you need more than energy in midfield for Man United. You need creativity. You need lads with a bit of character and heart.
“[Paul] Pogba's performances over the last few years for United to me haven't been good enough. It's as simple as that.
“And Pogba hasn't done enough, I think it was Bill Shankly who said years ago, 'sometimes with players they turn up and you don't know what you're going to get'.
“Pogba is like that. That is no good to you if you want to win league titles.
“For all Pogba's talent, he should be in the team, but he doesn't do enough. He doesn't do the other side of the game.
“He doesn't show enough spirit, enough fight. He has talent but that's not enough to play in midfield for Manchester United. You need a bit more than that."
It comes as Fernandes has given his take on playing alongside Pogba in the game against Arsenal.