The club signed the French striker, who is heading to Spain after scoring more than 20 goals in each of his two full seasons with Lyon.
Atletico Madrid completed the signing of Moussa Dembele, the French forward joining the Spanish side on an initial loan deal with option to buy.
Alongside Diego Simeone reached a deal to sign Dembele earlier this week, with the striker undergoing a medical exam on Monday.
The clubs have reached a deal to bring Dembele to Spain on loan with option to buy for 33.5 million euros (30 million pounds sterling / 41 million dollars) with a potential of 5 million euros (4.5 million pounds sterling / 6 million dollars) bonus. Atletico Madrid will also pay a loan fee of € 1.5million as part of the deal.
However, with transfer rumors swirling, Lyon sporting director Juninho admitted that Dembele’s motivation levels have plummeted in recent months.
He said Telefoot: “Moussa thinks it’s time to change team, that he has lost some motivation. It wasn’t something we planned, I like him a lot. I think Moussa has found it an agreement with Atletico. “
Dembele has only scored once in 16 appearances this season, having hit the 20-goal mark in each of his first two seasons with Lyon.
The French club have already moved closer to a replacement for the outgoing striker, signing Islam Slimani from Leicester.
The Algerian, who has only appeared once for Leicester this season, has scored nine goals in 19 appearances for Monaco in 2019-20.
Atletico Madrid, meanwhile, also occupy first place in their league as Dembele joins, with Simeone and co currently maintaining a four-point lead. real Madrid with two games in hand.