The Arsenal midfielder has joined OM on-loan for the rest of the season and he made his debut in victory over Lens yesterday.
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Marseille won 3-0, with Nwaneri scoring the opener as De Zerbi handed the 18 year-old an immediate place in his starting XI.
Afterwards, De Zerbi said: "Ethan Nwaneri will become a top player, I'm sure of that. You can see the quality, the impact. He's so strong, the same as (Quinten) Timber."
The win has Marseille sitting in third place in the Ligue 1 table, five points behind Lens and seven behind leaders PSG.