Pretty standard these days. Pretty much exactly the same deal as Rashford to Barcelona. If it goes well Roma will have got a bargain, if not they don't have to buy any we'll know a bit more about Ferguson
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In which case it sounds like Brighton have been the loser in the negotiation. If he's a success playing for a big club in a top European league, they sell him at the end of the season for less than what his value will be at that point. If he's a failure he ends up back with them with his transfer value further reduced.