2. Jackson Martinez
In second is former FC Porto man Jackson Martinez, the striker joined Athletico Madrid for $40 million from FC Porto the striker was already a good striker before joining the Madrid club although Athletico Madrid are known for buying young players and making them world Class players and then selling them off but on this transfer they skipped the first step.
The club sold the striker after he spent only six months with the club for an $8 million profit when they sold him to Chinese side Guanghoiu Evergrande for $48 million.
