Gary Neville thinks two Manchester United defenders will be 'exposed' when they come up against teams with quality full-backs.
United ran out 1-0 winners against Norwich City on Saturday evening but it was far from a vintage performance.
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A Cristiano Ronaldo penalty separated the sides and Neville pinpointed what interim manager Ralf Rangnick should be concerned about.
He told Sky Sports: "It wasn't a good performance. Against any other team in the league that would have caused them problems. If they go to Brentford and play like that they're in trouble. He'll take that week all day long. Two 1-0 wins.
"It was Norwich's lack of quality... Today I thought that any other team in the league that had any sort of quality about them would have caused real problems.
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"The one thing that Ralf Rangnick had to try and fix first was the defensive problems, and make them tougher to play against. I don't think they were tough to play against."
David de Gea made a number of vital saves throughout the game, with two notable ones from Teemu Pukki and Ozan Kabak in the second half.
Neville thinks the full-back pair of Diogo Dalot and Alex Telles, who've started both of Rangnick's Premier League games in charge, will be under scrutiny in a few months time.
He continued: "The big mystery of today for me is why Man United were so lacking in energy. I thought they would be a lot better than that after having a free week to prepare. We'll know a little bit more on Tuesday night [against Brentford].
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"Rangnick is still finding out about his players. I think there will be a problem with this system when they play against a team with good full-backs, with more quality.
"Dalot and Telles will basically get exposed.
"Fernandes and Sancho won't be able to get out in time by the time a [Joao Cancelo or a [Andy] Robertson or an [Trent] Alexander-Arnold are running down the wing.
"But they've got a few months before they play those types of players and I think by then, they'll have changed things around and he'll have got to know the players."
Previous manager Ole Gunnar Solskjaer preferred the pairing of Aaron Wan-Bissaka and Luke Shaw on the flanks.
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Wan-Bissaka arrived from Crystal Palace in 2019 in a deal worth £50 million, while Shaw was much improved following a spell in the wilderness under Jose Mourinho.
Dalot spent last season on loan at AC Milan while Telles was a summer buy from Porto.
United are now up to fifth in the Premier League and one point behind West Ham, who drew 0-0 with Burnley on Sunday.
Featured Image Credit: Sky Sports & PA ImagesTopics: Football, Manchester United, Premier League, Gary Neville
