#4 Isco (Real Madrid) - €700 million
As arguably one of the best attacking midfielders in the game and as a player who keeps the rumour mills churning out stories about him during every transfer window, Isco has earned the massive release clause that has been inserted into his contract.
Source:
www.marca.com/en/football/real-madrid/2017/09/14/59ba87bbe5fdeaf1218b45a1.html
A key member of the Real Madrid squad that became the first team to defend the Champions League title last season, Isco signed from Malaga in 2013 after he won the prestigious Golden Boy award. Since then, he has won every trophy possible at the club level.
The 25-year-old has been linked to clubs like Manchester United, Bayern Munich and Arsenal in the past and Real Madrid will have a hard time keeping their prized player.