Alvaro Morata is set to remain with Atletico Madrid through June 2020 with the club opting to pay €16 million (£13.8 million/$18 million) to continue the loan arrangement with Chelsea.
Morata originally joined Atleti in January, having fallen down the pecking order at Chelsea with Gonzalo Higuain entering the fold under Maurizio Sarri.
He originally signed for the Spanish club on a one-and-a-half year loan deal, with part of that agreement including a payment from Atletico Madrid that would see the club cover a portion of what Chelsea payed to sign the striker.