Maguire became the most expensive defender in the history of the game when he completed an £80million move from Leicester last month and the 26-year-old has started all four of United’s opening Premier League matches.
Victor Lindelof has played alongside Maguire throughout and the pair impressed on the opening weekend as United kept their first clean sheet since February in a 4-0 victory over Chelsea.
However, the Red Devils have conceded a goal in every game since and Maguire has faced some criticism for his displays at the back.
Asked by Premier League Productions to rate Maguire’s start in United colours, Sherwood replied: ‘Average. I don’t think he’s been great but I don’t think Man United have been great.
‘I don’t think it’s about individuals at the back, it’s about partnerships and him and Lindelof haven’t been good enough.
‘Sooner or later they’re going to have to work on that on that training field and get a partnership.
‘All the best centre half partnerships are not always necessarily the two best players. It’s the two that can work together better.
‘At the moment I think their understanding is not correct. They’re not covering around each other enough.’
Dimitar Berbatov believes this weekend’s clash with Leicester will be ‘particularly difficult’ for Maguire, but has backed United to come away from Old Trafford with three points.
‘United have a tough match against Leicester at Old Trafford on Saturday,’ the ex-United striker told Betfair.
‘It could be a particularly difficult one for Harry Maguire who joined them from Leicester in August.
‘Playing against your old club is s***. It’s very difficult to spend two seasons somewhere – as Maguire did at Leicester and I did at Spurs – showing what you can do then get a big move and have to play against your old teammates with whom you’re probably still in touch.
‘As hard as you try to be professional, friendships can sometimes get in the way.’
‘United’s performance against Southampton last time out was not what I want to see from United.
‘They need a win but that can make for a tense atmosphere and prevent you playing good football.
‘It will be interesting to see which United players go looking for the ball on Saturday.
‘I really hope they start as if they’re desperate to win.
‘An early goal would ease the tension but Maguire and his team-mates will need to keep it tight at the back, as they failed to hold on to the lead at Southampton.
‘I’m backing United to win a close match and, as they’ve only kept one clean sheet so far, will go with 2-1 as the score.’