Thomas Lemar (Getty Images)
"I'm very happy to be in Madrid and I want this [chapter] to start in the best possible manner. I can't wait to start."
Lemar said Antoine Griezmann and Lucas Hernandez' words helped him make his decision.
"Atleti have been interested in me for quite some time and after what Antoine and Lucas told me, I really wanted to come."
"I chose Atleti because I like the club and I've been following the team for a while," he continued. "Once the opportunity arose, it didn't take long for me to make my decision"
The 22-year old shared his excitement at his official unveiling on joining the Spanish giants who will be aiming to make a title push in La Liga this season.
"I’m very happy to be here. I really want to meet all my new team-mates and the fans at the Wanda," He said. "I’m going to give it my all for the team. I know what Atletico demands."
The slightly built Lemar looked set to join Arsenal a year ago but Monaco pulled out of the potential £92-million deal after selling a string of other stars.
He joined Monaco from French top flight club Caen for €4 million in 2015.
"In the last season, Lemar has continued to show his quality," Atletico said on their website. In fact he played 35 games for Monaco, showing his best form at the latter end of the season.