Osimhen arrived Italy on Tuesday morning with his agents.
The young striker according to several reports will be given a five-year contract, which is now believed to be worth 85 million Euros.
Napoli coach Gennaro Gatusso has insisted Osimhen is his No 1 target to replace Poland striker Arkadiusk Milik, who is set to quit the club this summer.
Milik has been linked with a move Tottenham Hotspur, Juventus and Atletico Madrid.
Napoli Close In On Osimhen Transfer
Osimhen linked up with Lille from Belgian Pro League club Sporting Charleroi last summer.
The 21-year-old scored 18 goals and provided six assists in 38 games across all competitions for Lille during the 2019/2020 campaign.
He was also voted the club’s player of the year.
The former Wolfsburg striker was on Monday named the Best African Player In Ligue 1 for year 2020.
By Adeboye Amosu