After a season in which they romped to a 20th league title, Manchester United are on the hunt for additional reinforcements in a bid to bolster their ranks.
Their exit from the Champions League in the first knock-out-round last campaign was perhaps a signal that they could not quite cut it on the European stage.
However, new manager David Moyes will look to bring in new faces and hopefully challenge the likes of Bayern Munich and Barcelona for the Champions League crown.
Here we will take a look at potential targets and which ones Moyes should sign.
Ezequial Garay or Leighton Baines
Both of these players have been heavily linked with moves to Old Trafford, as United look to improve on a defence that shipped 43 goals in the Premier League alone last season.
Garay is seen as a long term successor to Rio Ferdinand, however, with the likes of Johnny Evans, Chris Smalling and Phil Jones all proving to be quality young talents, and not to mention the club captain Nemanja Vidic, the need for a new centre-back is not that urgent.
Baines on the other hand is a proven Premier League player who seems destined to play for one of the top teams. The 28-year-old was named in the Premier League Team of the Year ahead of the likes of Ashley Cole and United's current left-back, Patrice Evra.
With Alexander Buttner and Fabio both failing to impress defensively, a replacement for the ageing Evra becomes all the more necessary, and Baines could be just the right man.
Thiago Alcantara or Kevin Strootman
With deals for both of these players seemingly done, David Moyes may have two top notch central-midfielders on his hands.
Thiago has had limited opportunities at Barcelona yet has still managed to demonstrate his abilities, in particular his hat-trick in the European Under-21 final against Italy.
He has been likened to Xavi in the way he can retain possession with short passes and have the vision to play a cross-field ball.
The uninspiring displays of Anderson coupled with the long-term absence of Darren Fletcher have lead to a Thiago-shaped hole in the United midfield.
Strootman was also on display at the European Under-21 Championships, and despite not grabbing as many headlines as Thiago, his tireless work and steely determination showed that he could be the ideal Manchester United player.
United have lacked a real box-to-box midfielder for the past few seasons and Strootman could be the answer to this problem as he would add both bite and goals to a lacklustre United midfield.
Cristiano Ronaldo or Gareth Bale
Two of the biggest names in football have been linked with United this summer as Moyes looks to make a bold statement of intent for the upcoming season.
Gareth Bale was named PFA and PWA player of the year as he took the Premier League by storm, stacking up an astounding 21 goals in the league from midfield.
He has also shown his ability on the European stage, notably his hat-trick against Inter Milan and his more recent free-kick double against Lyon.
A major problem could come in the form of his price tag, with Tottenham resolute in their ambition to retain the player. A world record fee would be needed, as competition from Real Madrid could force his valuation even higher.
The alternative, and a move that would surely win David Moyes the hearts of almost every United fan, would be to sign Cristiano Ronaldo.
The Portuguese wizard left Old Trafford for the Bernabeu in 2009 and has gone from strength to strength, notching up 201 goals in 199 games for Los Blancos, which is an incredible goal tally.
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