Osimhen has been missing from the team’s matchday squad list this season.
The club’s next league match will be against Parma at the Stadio Diego Maradona on Saturday.
HOW OSIMHEN’S MOVE TO CHELSEA OR AL AHLI WAS BOTCHED
Chelsea have been a long-term admirer of Osimhen and the London club looked keen to sign the striker this summer.
However, both parties failed to see the move through due to disagreement over Osimhen’s wage demand.
The Blues reportedly offered the striker a €4m initial annual salary, a fraction of what he earns at Napoli.
Al Ahli were also interested in getting Osimhen into the Saudi Pro League.
Napoli had initially accepted a £67.3 million (€80m) offer from the Arabian club for the striker, who would have earned £33.6 million (€40m) a season.
But the Italian club reportedly demanded another €5 million added to the deal, prompting Al Ahli to look elsewhere and sign Ivan Tooney from Brentford.