The 22-year old has made it clear to the Ciel et Marine president that he intends to depart in the current transfer window, and has revealed he would like to join les Dogues
The Cape Verde international began his career at Batuque before moving to Le Havre in 2008, and went on to make 97 appearances for the Ligue 2 side, scoring 19 goals during his four-year stint.
Speaking on RMC about his future, Mendes explained: "I spent many happy years at Le Havre, but today I want something else.
"I talked to my president and I told him I want to go to Lille. Lille is my priority."
Les Dogues have looked to reinforce their strikeforce following Eden Hazard's €41 million move to Chelsea, and Mendes looks set to be their third attacking signing of the transfer window after Marvin Martin and Salomon Kalou were also snapped up.