Manchester United and Chelsea have agreed on a deal worth £48 million, plus £2 million in potential add-ons, to send 22-year-old Brazilian midfielder Andrey Santos north. Santos was filmed leaving United’s Carrington training facility after completing his medical on July 9, putting the transfer on the verge of completion.

The total package could reach £50 million.

The deal structure is the interesting part

Chelsea negotiated a 10% sell-on clause into the agreement. That means if Manchester United eventually sells Santos for, say, £80 million, Chelsea pockets £8 million on a player they no longer employ.

Santos had already agreed to personal terms before the medical, which means the player’s wages, contract length, and bonus structure were locked in. The medical was the final procedural hurdle, and being filmed leaving Carrington suggests it went smoothly enough that nobody felt the need to keep things quiet.