sport news transfer window: Who could they sign and how does it compare ...

While all their top-four rivals continue to strengthen their squads, are moving at a pedestrian pace by comparison.

Donny van de Beek remains the club's only summer signing to date with the transfer deadline slightly over a fortnight away on October 5.

Former Red Devils centre back Rio Ferdinand is the latest club legend to speak out against their lack of activity so far.

Manchester United manager Ole Gunnar Solskjaer has only made one signing this window

manager Ole Gunnar Solskjaer has only made one signing this window

Midfielder Donny van de Beek arrived earlier this month from Ajax in a £40million transfer

Midfielder Donny van de Beek arrived earlier this month from Ajax in a £40million transfer 

Comparing United's business to Chelsea's, Ferdinand told : 'Frank (Lampard) has made signing players like it's the norm, like it's easy - water off a duck's back.

'The difference in the way Chelsea have done their business compared to say my team Man United… there is no noise, there's nothing going on, all you're seeing is bang - deal.

'Little bit of talk, bang-deal. That is what's frustrating for me and all the Man United fans.'

So, why have United been slow in the market so far? Sportsmail analyses why...

United legend Rio Ferdinand is unhappy at their lack of transfer activity calling it 'frustrating'

United legend Rio Ferdinand is unhappy at their lack of transfer activity calling it 'frustrating'

Who have they signed?

So far, just Van de Beek who joined in a £40million transfer from Dutch giants Ajax earlier this month. 

The 23-year-old automatically bolsters 's central midfield options - which looked particularly light around the festive period.

The Dutchman could now form part of an exciting midfield trio alongside Paul Pogba and Bruno Fernandes. While it is a welcome addition, more is needed at Old Trafford.

Van de Beek improves United and could now form part of a tantalising midfield for Solskjaer

Van de Beek improves United and could now form part of a tantalising midfield for Solskjaer

How does it compare to their rivals?

Not great, not great at all. may have finished third last season but they would do well to repeat that display following their rivals' investment.

Champions Liverpool have also made one just one signing so far, in left back Kostas Tsimikas, but they are closing on midfielder Thiago Alcantara. The Bayern Munich superstar is one of the world's best and is without doubt a statement signing.

Runners-up Manchester City have bolstered in the shape of exciting winger Ferran Torres and centre back Nathan Ake - both have been linked with a move to United this summer.

Liverpool have agreed a £25m fee with Bayern Munich for Spanish midfielder Thiago Alcantara

Liverpool have agreed a £25m fee with Bayern Munich for Spanish midfielder Thiago Alcantara

Nathan Ake has joined Manchester City - in a move that'll bolster their defensive options

Nathan Ake has joined Manchester City - in a move that'll bolster their defensive options

Arsenal have been shrewd in the market and Willian made an impressive debut in the 3-0 win over Fulham, assisting all three goals, while Tottenham have brought Pierre-Emile Hojbjerg and Matt Doherty to improve their starting XI. Spurs are close to completing the return of Gareth Bale from too, albeit on loan, which will add an undoubted X-factor to an impressive frontline that includes Harry Kane and Son Heung-min.

Without doubt though, Chelsea have caught the eye this transfer window. The Blues who finished below United on goal difference last term, who have spent more than £230m on six players so far. Timo Werner, Hakim Ziyech, Ben Chilwell, Thiago Silva and Kai Havertz can all expect to start for Lampard's side, hence Ferdinand's comments.

Real Madrid outcast Gareth Bale is on the verge of re-joining Tottenham - via a loan move

outcast Gareth Bale is on the verge of re-joining Tottenham - via a loan move

Chelsea have splashed the cash this window - including the £89million arrival of Kai Havertz

Chelsea have splashed the cash this window - including the £89million arrival of Kai Havertz

Where do need to strengthen?

A right winger is a priority - a position the club have failed to fill properly since Nani's departure. Mason Greenwood excelled in that role after football's restart, but manager Ole Gunnar Solskjaer knows he needs to sign a permanent fixture there allowing Greenwood to develop as a central striker.

A left back and a centre back are the two other causes for concern. Luke Shaw is first-choice in the former but the England international has been beset by injuries so cover is needed. 

Brandon Williams performed brilliantly there throughout last season, but he could be switched to right back - vying for that role with Aaron Wan-Bissaka. As for centre back, it's clear that a more athletic defender would compliment the skills of captain Harry Maguire.

United have been crying out for a right winger since the departure of Portuguese flyer Nani

United have been crying out for a right winger since the departure of Portuguese flyer Nani

A more athletic centre back to partner Harry Maguire (right) wouldn't go amiss at Old Trafford

A more athletic centre back to partner Harry Maguire (right) wouldn't go amiss at Old Trafford

Who could they sign?

Very good question considering United's transfer policy this window.

Jadon Sancho remains the No 1 target and would undoubtedly improve their frontline - in what would be a true statement of intent to United's rivals.

Sancho provides skill, poise, end product and overall X-factor that would provide another weapon in United's armoury and his numbers this season testify to that. 

In 32 Bundesliga games for Dortmund he scored an incredible 17 goals alongside 16 assists as they finished second. This output made him Dortmund's top goalscorer and assist-maker in the league.

Dortmund's Jadon Sancho would be an automatic starter in United's line-up on the right wing

Dortmund's Jadon Sancho would be an automatic starter in United's line-up on the right wing

However, United have been at loggerheads with over their £108m valuation for the forward. And as a result, United are looking at other targets to fill the right-flank void.    

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