first of all you had to buy him on a regular auction, because this is the best protection against cheaters - hundreds of eyes of people who also look for players like him and check if the price is right.
Another thing for the TL is, that you know his skills.
A third point for the tl is, that you would find a lot of promising players there, probadly some like you are expect your opposing player ;)
And if that is not enough send him a BB mail, and ask if you could buy him