The nine most expensive buyout clauses in world football: Arsenal and Chelsea targets set to cost mega money

8. Jackson Martinez – FC Porto

Buyout fee: £27.5m

A player likely to move on over the summer, the Colombian international has been a thorn in the side of Portuguese Premier League defence’s for the past three years. Set with a relatively low fee because he’s not yet been tested in one of Europe’s top five leagues, though Arsene Wenger may look to change that in the coming weeks.