With Champions League football now guaranteed, there is a high expectation of a lot of incomings and outgoings at the club.
It has been widely acknowledged that Manchester United are to spend big in the hope they can reach the success levels the fans are used to.
So with Memphis Depay already on his way in from PSV Eindhoven, who else could be joining him this summer?
Angel Di Maria and Adnan Januzaj have struggled this season, so another attacking midfielder could be necessary to make United a more formidable opposition next season.
Bale's first season with Real Madrid was successful, scoring on average a goal every two games, as well as scoring key goals in both the Copa del Rey final and the Champions League final on the way to a cup double.
With his future in doubt, a move back to the Premier League has been touted as a big possibility, and Manchester United are one of the few clubs that would interest Bale, and could also afford him.
A big problem with him at Real Madrid is living in the shadow of Cristiano Ronaldo, and this seems to have severely shaken his confidence, and affected his form as a result.
This transfer would solely depend on the future of David de Gea. The Spanish goal keeper has been the best 'keeper in the Premier League this season, earning countless points for United and a lot of praise along the way, culminating in him being in the Premier League Team of the Year.
However, with his contract up at the end of next season, he has been heavily linked with a move to Real Madrid. And if he does decide to move to Spain, Hugo Lloris is being considered as Manchester United's first choice replacement for De Gea.
Lloris has been impressive since signing for Spurs in 2012, and although the fee would have to be high to tempt Spurs to sell, what United would be getting is a top-drawer keeper. Quick off his line, as well as a great shot-stopper, Lloris would be an excellent replacement if De Gea was to move on.
The Borussia Dortmund central midfielder has been on Manchester United's radar for some time, and with Jurgen Klopp set to leave Dortmund at the end of the season, it could be the right time for Gundogan to also move on.
And with Manchester United's obvious lack of depth in the central midfield department, further demonstrated by their form without Michael Carrick available, the German international could be exactly what Louis van Gaal is looking for.
A quick central midfielder with a good work ethic and an eye for a pass, not to mention his age of just 24, he could be an important Manchester United player for years to come.
Ilkay Gundogan's team-mate, and Borussia Dortmund club captain, Mats Hummels, is one of the most highly regarded central defenders in European football.
Long-time admirers include Manchester United, who are also looking for centre back options. And with Hummels's defensive and leadership qualities evident in his performances over the past 4 or 5 years, it is no wonder why he's in high demand.
Hummels following Gundogan out the Dortmund exit door is not inconceivable either, but a less likely signing compared to the central midfielder.
Let go by Sir Alex Ferguson in the summer of 2012 on a free transfer to Italian champions Juventus, Paul Pogba has come on leaps and bounds since moving to the Old Lady, and has established himself as one of the best midfielders in world football.
Leaving United in controversial circumstances, as he felt he was last in the pecking order and disrespected by the club, there may be some bitterness there.
However, this may more likely rest between Pogba and Ferguson, rather than between Pogba and Manchester United. With Sir Alex no longer at the helm, a potential return may not yet be out of the question.
His performances in the last two seasons have made him one of the most in-demand players in the world, with Barcelona, Real Madrid, Chelsea, Manchester City and Manchester United all linked with the Frenchman.
At the age of just 22, Pogba could go on to be one of the best players, if not THE best player in the world for years to come. But is there a chance he would move back to the club who, in his words, disrespected him to the point where he had to leave? Only time will tell.
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