But with a week to go, and some big decisions to make as to which path they opt to go down, GIVEMESPORT have ranked the names linked to decide who the best target would be for Man Utd.
The player is open to a move to Man Utd, but the asking price of around £30m is high for a player of his age and with his ceiling.
His profile is perfect for the modern full-back, and his age means he will only continue to get better in the future.
Capable of playing in either central midfield or at left-back to a world-class standard means that he could solve a lot of issues in the Man Utd squad.
He may not be a traditional left-back, but he is the best option for Man Utd if they really want to go all out.
Manchester United have completed their midfield rebuild this summer with the arrival of Carlos Baleba alongside Youri Tielemans and Andrey Santos, and now attention has turned to other areas of the squad before the deadline.
With the transfer window set to close in a week, the Red Devils are looking at other ways to strengthen Michael Carrick's squad following their 2-0 defeat to Hull in the opening game of the Premier League season, which made it clear that they still have some issues that they need to deal with if they want to be competitive.
A forward is something that could be looked at should Joshua Zirkzee be on the move amid interest from Aston Villa and clubs in Italy, but left-back is seen as a priority at this stage. Luke Shaw is in the final year of his contract at Old Trafford, and a number of names have been linked with coming in to compete with him and offer depth in the position too.
But with a week to go, and some big decisions to make as to which path they opt to go down, GIVEMESPORT have ranked the names linked to decide who the best target would be for Man Utd.
5 David Raum - RB Leipzig
An experienced name and a long-term target at Old Trafford, David Raum's name has once again emerged as a potential option to fill the left-back spot at Man Utd.
The 28-year-old is into the final year of his contract at Bundesliga side RB Leipzig, and is understood to be allowed to leave if the right offer comes in for him. The player is open to a move to Man Utd, but the asking price of around £30m is high for a player of his age and with his ceiling.
As a short-term option to find competition for Shaw, he could be a solid option for the right price, but United would need to negotiate the price down to make it worth their while, and also ensure that all their other options have been exhausted first.
4 Jorge Salinas - Racing Santander
via Jorge Salinas Instagram
At the other end of the scale when it comes to age and profile, Jorge Salinas is someone who has been linked strongly with a move to Man Utd this summer.
The Spain youngster has a €16m (£13.6m) release clause in his contract, but has also attracted the attention of Barcelona and Atletico Madrid this summer, meaning competition for his signature will be stiff. It's also fair to say that while the 19-year-old can play at left-back, his future is likely at centre-back, with comparisons to Sergio Ramos making sense.
Considering his age and price, this would be an ideal transfer for United if they view another target as being attainable in a future transfer window. It would also help future-proof the squad in more than one position, but his profile for full-back may not be what the club are looking for for Carrick's squad.
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3 Alejandro Balde - Barcelona
Alejandro Balde has been linked with a move away from Barcelona for the best part of 12 months as the Catalan club look to raise funds, but there seems to be more to it in this window than in previous ones.
The Spain international was left out of the squad for the opening La Liga game against Elche this past weekend, and Man Utd are reported to have made a formal contract offer to the player ahead of approaching Barcelona, who value the 22-year-old at between €35-45m (£29.9-38.5m).
His profile is perfect for the modern full-back, and his age means he will only continue to get better in the future. But injuries have been a concern in his career, and it could mean that moves for alternatives are ruled out if he joins. A loan deal with an option to make it permanent could be the perfect solution, but unless Barcelona change their mind that looks unlikely to be a possibility.
2 Lewis Hall - Newcastle
via Reuters
Man Utd have made it clear that their top target for the left-back position is Newcastle star Lewis Hall, but the Magpies have shut down any hopes of that deal happening this summer.
The player would be very keen on making the move to Old Trafford, but a deal is likely to cost in excess of £70m, and that means next summer is a more likely timeframe for that to happen. However, the player's injury problems are undoubtedly a bit of a concern to consider, and the high fee means he would be undoubtedly the first-choice in the team.
1 Myles Lewis-Skelly - Arsenal
Action Images via Reuters/Paul Childs
It's very rare that a player is a top-level talent in multiple positions, but Lewis-Skelly is absolutely that. Capable of playing in either central midfield or at left-back to a world-class standard means that he could solve a lot of issues in the Man Utd squad.
The player is understood to be very happy at the Emirates Stadium, but reports suggest that Arsenal are willing to sell for the right price despite Mikel Arteta wanting to keep him, and Man Utd are confident that if the price drops they can win the race for his signature.
His age means he is only going to improve, but he has also already got the winning bug after lifting the Premier League last season and playing in consecutive Champions League semi-finals, as well as the final last time around. He may not be a traditional left-back, but he is the best option for Man Utd if they really want to go all out.