#1 Gareth Bale
Bale's lucrative switch to Real in 2013 broke the world-record transfer fee and given both his ability as well as the potential to succeed in Spain, it comes as no surprise that he flourished in his debut campaign - netting crucial goals which powered Real to a Copa del Rey and Champions League double.
Since then though, he's only shown flashes of his individual brilliance due to troublesome injuries keeping him sidelined.
Real president Florentino Perez is considering a squad overhaul and given Bale's injury issues, it's not much of a surprise that he could be sold this summer to free up funds elsewhere.

At 28, he will still be keen to prove his worth and silence his critics - some of whom believe his best days are now behind him. European clubs have been monitoring his progress for a few seasons and he's no longer their shiny new toy, meaning they're likely to have less patience with him if they do not see immediate results.
Despite Zidane's recent comments, it's clear that Manchester United are, and have been interested in signing the former Spurs winger for a few seasons now. It's widely believed that Real are keen to appease Marco Asensio with more first-team minutes, which might eat into Bale's chances of regular football going forward.
Some reports meanwhile, have suggested he'd be offered to Chelsea as part of a deal to convince them into selling Eden Hazard for a cheaper transfer fee. It's likely that given his undeniable quality, Real may be forced into selling him in the hopes of finding a younger player, one who is not so unfortunate with injuries.