Genoa's reluctance to place a buyout clause into his loan deal resulted in Lazaar remaining on United's books and the left-sided player could now end up remaining with the club's reserves.
When asked for an update on Lazaar's position after he'd flown out to Italy, Toon boss Rafa Benitez said: “He has to come back. It is not done.
“So he has to return to Newcastle and train."
He added: “The transfer windows are still open elsewhere."