The Cameroon international is a loan target for Trabzonspor, reports Takvim, with the Turkish transfer window not closing until September 12.
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With Senne Lammens' arrival and Altay Bayindir having played all three of United's Premier League games, it's suggested Onana could be available.
For the moment, United have four senior keepers on their books: Onana, Lammens, Bayindir and Tom Heaton.
It's been suggested Lammens has joined United with the plan for him to be manager Ruben Amorim's new No1.