5. Radamel Falcao
Falcao has established quite a formidable reputation in recent seasons, with the Colombian international proving himself to be one of the world's most-prolific strikers during successful spells with FC Porto and Atletico Madrid.
The 27-year-old left the Vicente Calderon this summer, having been coaxed to Ligue 1 by the financial might of Monaco for a reported fee of £50 million.
If he continues to perform at such an elite level under Claudio Ranieri, it is not beyond possibility that someone could offer double that fee in the future.