Sergio Aguero
If you're currently managing a top class team, (champions league football is probably required to persuade him to hjoin) buy Sergio Aguero from Athletico Madrid, in Spain, as he becomes one of (actually the best, but whatever) the best players in the game. For me, he won 4 World Player of the Year awards, scores an incredible amount of goals and only gets better.
Best buy in the game, IMO.
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