Kevin Davies says Manchester United would not be holding a top-four position in the Premier League, were it not for their Spanish goalkeeper David de Gea.
David De Gea makes a fingertip save from West Ham's Enner Valencia.
The 37-year-old Davies could be named in the Preston side to face the Reds at Deepdale in the FA Cup on Monday and the striker has not been impressed by United’s recent performances.
Davies pointed out: "When you consider de Gea's been their best player, he's not been that well protected.
“Without him they wouldn't be in those top four positions, I don't think there's any question about that.
"They haven't had a settled back three, back four, whatever they're playing, back five at times. Whether Van Gaal would pick the same team anyway with the rotation and things you don't know.
"I think it's an area they'll need to improve if they get into the Champions League and if they want to start competing for the title again with Chelsea being so strong and Man City ahead of them.
"I think the squad needs an overhaul and he (manager Louis van Gaal) is starting to do that.
“You can't just do that in one or two windows. I think he will get it right and we will see Man Utd over the next six or 12 months get better and better and play a better style of football.
"They've spent money and they should be contesting those Champions League spots.
"In terms of watching them, I don't think they're as exciting as they used to be but, when you lose someone like Sir Alex Ferguson, it's always going to take time.
"They've got a bit of resilience about them. Not playing well and winning games you have to have. He's not had a settled side, there's been a lot of injuries. I don't think he's quite found the right system.
"Just looking at one or two of the players, like (Robin) van Persie scoring (against Burnley), no real smile, he didn't look particularly happy.
"It's probably different to what those players are used to. Players don't particularly like change anyway but a new manager comes in, new ways, are they enjoying it as much as they used to? I don't get that impression from the players.
"But you have to do the job that the manager asks of you. They're fantastic players but I don't think they're living up to expectations."