Gary Neville believes that Manchester United have "more problems than solutions" in midfield while the Red Devils endeavor for the Premier League.
He adds that it could an "error" not to have Jadon Sancho.
United's Premier League disappointment increased on Sunday when they fell to Arsenal in a 1-0 defeat.
Through their loss to Arsenal, United could only win two of their first six Premier League competitions.
Neville is concerned about the area of midfield, because of the club's incompetence to sign Borussia Dortmund star Jadon Sancho this summer.
"There are more problems than solutions," Neville told Sky Sports. "You have six midfield players at the club:
Nemanja Matic, Fred, Scott McTominay, Bruno Fernandes, Donny van de Beek and Paul Pogba,
and you've somehow got to get them into a system, which is forcing Ole to play a diamond.”
"I think there was an element today of him thinking he could just put four players in that diamond and it would work after what happened in midweek but McTominay on the right-hand side wasn't working after five minutes.”
"You have to be comfortable moving out into that wide area; [Aaron] Wan-Bissaka's already a bit awkward on the ball at right-back so you need someone to balance it and the balance on the right is a real problem for United.”