French international Paul Pogba is the latest big name to be linked with a move to Manchester United, with the 22-year old being linked with a world record £100 million move to Old Trafford, according to Sky Sports News.
Despite at times being used as a defensive midfielder for both Juventus and the national team, Pogba's best attributes are his pace and power going forward, and it would represent another attack-minded signing, having already brought in Zlatan Ibrahimovic and Henrikh Mkhitaryan.
New United boss Jose Mourinho has only signed one defender in Eric Bailly, and it is an issue he must address if the Premier League trophy is to return to Old Trafford.
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Louis van Gaal's side conceded 49 goals in the Premier League last season, a key factor in their failure to achieve Champions League football.
Van Gaal spent over £250 million at Old Trafford but failed to sign a natural centre-back, often placing Daley Blind at the centre of United's defence with England's Chris Smalling.
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Smalling has improved massively over the last couple of years and had a very good first half of last season, but he is still prone to mistakes, demonstrated by his sending off against Crystal Palace in the FA Cup final.
Blind does his best work in defensive-midfield and it would be a surprise if he were to feature in United's defence next season, as he certainly isn't a Mourinho type centre-half.
The same applies with Marcos Rojo, the Argentinian is a more natural left-back and you have to question his defensive abilities.
With the attacking signings over the line and Pogba reportedly close, Mourinho should now turn his attentions to his defence, and he should consider signing a new centre-back in order to tighten up the side's backline.
World Cup winner Mats Hummels was heavily linked with a move to United over the last couple of seasons, but he has now joined Bayern Munich.
Raphael Varane and Marquinhos have both been linked with big-money moves to Old Trafford, but nothing formal has come out of the reported interest, despite Mourinho being a huge admirer of the duo.
The former Chelsea manager's pursuit of England's John Stones was well documented last season, with Mourinho having four bids for the Everton youngster rejected, despite the bid rising to £40m.
Mourinho may well want Stones for the future, but like Varane and Marquinhos, nothing formal has happened as of yet.
Mourinho will know that if he is to challenge Guardiola for the title next season, then he will need to bring in a world-class centre-half as United's failure to replace Rio Ferdinand and Nemanja Vidic has cost them dearly in recent seasons.
The attacking additions are done, it's now time for Mourinho to focus solely on the defence.
What defender should Manchester United sign this summer? Leave YOUR suggestions in the comment section below!