Atletico Madrid have announced that they have completed the signing of Yannick Ferreira Carrasco from French side AS Monaco.
The Belgian, who is reported to have cost around €20m (£14.4m), has signed a five-year contract with the La Liga side.
Sporting director Jose Luis Perez Caminero told the club's website: "We are very satisfied with the agreement reached with Monaco, because Yannick is a player with huge prospects and with an incredible future.
"He is a player with great speed, who's excellent at driving the ball and has a great shot. He will contribute perfectly to our aim of increasing the quality of our team and the competitiveness in the group. I am convinced that he will contribute a lot to the team."
The 21-year-old is Atletico's third new signing of the summer, following the arrivals of Jackson Martinez and Luciano Vietto.