Quite a complicated one, this, but let me explain...
Athletic Bilbao have announced that Kepa Arrizabalaga has bought himself out of his contract. This is the done thing at Athletic Bilbao; the same happened with Ander Herrera, Javi Martinez and Aymeric Laporte.
It essentially means Kepa is now a free agent and will join Chelsea. The Blues will have paid the money to Kepa, his agent or the company who owns him in order to buy himself out of the contract.Make sense? Good.