The 22-year Turkish international joins the Ligue 1 side on a five-year deal. The fee is understood to be 16.5 million Euros, APA reports referring to Ronaldo.com website.
He has come through the ranks at Trabzonspor. Playing in the academy teams and making his pro debut in 2015.
In 100 top-flight games, he has managed to find the back of the net 22 times as well as 21 assists.
He has represented the Turkish national team at senior level 14 times.
Lille general manager Marc Ingla said of the signing:
“He has great technical qualities, an ability to create shifts, a very good quality of shots and pass, and a remarkable left foot. Yusuf will further enrich our workforce for the upcoming season.”
Lille have been busy this transfer window.