Beye has been using the Arsenal loanee off the bench since taking charge of OM after Roberto de Zerbi's departure.
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Nwaneri struck against Lille in last week's win as a second-half substitute and also came off the bench in last night's defeat at Monaco.
“He is a great talent who needs to adapt to Ligue 1 and its intensity,” Beye said before last night's clash.
“Against Lille, he scored, but there are still aspects of his game that need to be much stronger.
“He needs to understand that he is arriving at a really top-level club. What is good is that he scored with his national team (England U21s).”