#3 Dele Alli – Tottenham Hotspur (Jan 2016: €5 million, Now: €40 million)
Increase in value: €35 million
Dele Alli has established himself as one of the best young midfielders in the world in the last couple of seasons. On top of being a creative force to be reckoned with, the 21-year-old has also made a name for himself as a goalscorer having netted an incredible 22 goals from midfield last season.
The Tottenham Hotspur superstar has seen his stock skyrocket in the last 18 months as he, along with striker Harry Kane, helped lead the White Hart Lane outfit’s title challenge in the last two seasons. If Spurs are unable to win something of note in the upcoming season, it is almost guaranteed that the English midfielder will be lured away by one of Europe's biggest clubs, who will have to part with a considerable fortune given Alli's present market value.
In the last 18 months, Alli's market value has soared from a meager €5 million to the €40 million it is as of now, and it is only going to rise further.