#4 Wilfried Zaha - Manchester United to Crystal Palace

After initially joining on loan in the summers of 2014, Zaha's move to the Selhurst Park was made permanent on 2 February 2015 for a fee of around £5 million. Capable of playing as a forward or a winger, the Ivory Coast international has been a revelation at Crystal Palace.
A pacy dribbler with an eye for goal, Zaha has turned his fortunes around at Selhurst Park. To the delight of Palace fans, Zaha has won three club's Player of the Year award at Crystal Palace, a feat only achieved before by goalkeeper Julian Speroni.
Over the past few years, Zaha has been one of the very few positives at Selhurst Park and is the sole reason that Crystal Palace are still a Premier League side.
#3 Javier Mascherano - West Ham to Liverpool (initial loan)

Mascherano joined Liverpool on deadline day in what was one of the most complicated deals in the history of transfer deals.
Joining on an initial 18-month loan, the midfielder was worth the hassle. After his arrival, Mascherano quickly established himself as one of Rafael Benitez's favorites. The deep-lying midfielder was an important piece of the puzzle in the Reds team that reached the 2007 Champions League final.
The Reds also came very close to winning the league title in the 2008-09 season. Mascherano made a total of 139 appearances for the club before finally joining Barcelona in 2010.