Well he'll have say 2-3 years left at the top. Clearly a 23 year old is worth far more if he has the potential.
Next summer I think you'd be looking at say £30million-£40million. That is a huge sum for an outfield player with just a few years left.
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Just because you think he's worth as much as someone like Mbappe/Lukaku... He isn't. Who is the most expensive 30 year old in football history. The record transfer for a player over 30 is £23million.
http://talksport.com/football/golden...0624151978?p=9