The 21-year-old Dutch-born Turkish youth international enjoyed a breakout season in the Netherlands, making 34 appearances in all competitions, scoring nine goals and providing nine assists.
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He also played a key role in NEC’s run to the KNVB Cup final, where they eventually lost 5-1 to AZ Alkmaar.
Lille are looking to strengthen their wide attacking options after struggling for consistency in that area during a poor run of form at the start of the year.
Midseason arrivals Gaetan Perrin and Noah Edjouma have yet to make a major impact, while Matias Fernandez-Pardo is also linked with a possible departure.
NEC are reportedly demanding around €7m for Onal, with negotiations between both clubs still ongoing.