On Thursday, the young striker completed his switch to the Great Danes from the Belgian First Division A club, penning a five-year deal with the French Ligue 1 side.
Nwosu is delighted with the transfer of the youngster, who notched 20 goals across all competitions for Charleroi last season, and believes the Stade Pierre-Mauroy outfit will help in his development.
“It is a right step in the right direction. He did very well at Charleroi, scoring a lot of goals and I believe he will perform better in Lille,” Nwosu told Goal.
“He is growing, he is still young and Lille is a place where he can improve more and develop his talent. I am sure he will not be under pressure that can derail his performance because there is always pressure in football anyway.
“My advice for him is to play his normal game. I believe he can score more goals for Lille than he did for his former club last season.
“He just needs to remain dedicated and consistent. He should prove that he is capable of playing in top football because Ligue 1 is bigger than the league in Belgium.”
Osimhen could make his debut for Lille when they take on Roma in a pre-season friendly game on Saturday.
The forward will hope to make his first Ligue 1 appearance when his side lock horns with Nantes in their opening 2019-20 game on August 11.