The Anglo-Nigerian is set to join the Ligue 1 side for the second half of the season in a bid to get regular minutes after struggling at the Emirates Stadium under Mikel Arteta.
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"William Saliba told me OM is one of the best clubs in the world," Nwaneri said.
Frenchman Saliba joined Arsenal in 2019 before returning to Saint-Etienne to continue his development. He then spent the second half of the 2020-21 campaign on loan with Nice and then moved to Marseille for the 2021-22 season.
The 24-year-old returned to North London in 2022, and has gone on to become a star player for Arsenal.