Osimhen was introduced in the 62nd minute for Diego Demme.
The Super Eagles striker almost marked his debut with a goal on 80 minutes but saw his effort go just off target.
Dries Mertens opened scoring for Napoli in the 64th minute before Lorenzo Insigne doubled the lead on 77 minutes.
The win puts Napoli top in the league table ahead of Fiorentina on goals difference.
By James Agberebi
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