#3 Neymar

Neymar has come under intense scrutiny in recent days following rumours about his interest in a Real Madrid move. Florentino Perez would jump at the chance to sign the Brazilian today, watching Zinedine Zidane's misfiring front line. However, Neymar would cost an arm and a leg and Los Blancos will also have to carry the regret of not signing him for a cheaper price in the past.
Neymar's hide and seek with Real Madrid started in 2006 when he rejected a chance to join their youth academy. Later, he rebuffed a better package offered by the giants to join arch-rivals Barcelona. History repeated itself for the third time when he chose Paris Saint Germain over Real Madrid in 2017.
That's what we know. But, coming back to the second time, it was vice-versa. Real Madrid pulled out of the race to sign Neymar in 2013 because, according to Perez, he was just using them to get a better package at Barcelona. Back in 2013, he had even completed a successful medical at the Bernabeu before the club decided against signing him.
Of course, they did sign Gareth Bale later, but the Welshman hasn't been exactly as good as the Brazilian, has he? There's a series of injuries that has haunted him since his move to the capital.
Had they known how future would pan out, Florentino Perez would have gone to any lengths to bring Neymar to the Bernabeu for sure.