Recent weeks have brought together a wave of speculation over the future of Real Madrid star, Cristiano Ronaldo.
The three time Ballon d'Or winner is reportedly unhappy with life in Madrid, which could see the Portuguese bid farewell to the Santiago Bernabeu next summer.
Reports suggest Ronaldo is no longer comfortable following multiple fall outs with manager Rafael Benitez, with Spanish publication Marca's front page on Wednesday reading: 'The heavyweights of the squad dont share Benitez's methods', suggesting discontent amongst the Real camp.
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There appears to be two main candidates vying for Ronaldo's signature at this early stage: former club Manchester United and Ligue 1 side Paris Saint-Germain.
It would seem there are legitimate reasons for joining either side next summer. PSG would offer the winger a new challenge and life, whilst a return to Manchester would hold a sentimental factor for Ronaldo.
There are obvious issues with a move to United, though. The transfer debacle surrounding David de Gea's proposed move to Real over the summer could prove a sticking point, given the two clubs' relationship could have soured as a result.
It would appear, therefore, that if United wanted to bring back Ronaldo, they would first have to part company with fan favourite De Gea. Likewise, if Madrid want De Gea, Ronaldo could prove key.
Any possible transfer would most likely see the Red Devils lose their Spanish 'keeper and pay cash for the Real forward, with Los Blancos likely to hold out for at least £60 million.
What will work in United's favour, however, is the fact De Gea signed a new deal this summer that would see him stay until 2019, meaning it would cost Real a world-record sum of money for a goalkeeper to prise him away from Old Trafford.
For both teams, these two players are considered either side's best and arguably the best in the world for the positions they occupy. Ronaldo, though, is now 30 and heading towards the later stages of his career, whilst De Gea, 25, still has the best part of his career to go.
As enticing a move it might be to bring back Ronaldo, opting to retain their young goalkeeper, who has many years ahead of him, could prove the wiser decision.