The Gunners academy product is set to join the Giallorossi on loan until the end of the season.
A deal has been agreed in principle, and while Mourinho was hesitant to talk about the loan, the Portuguese admitted he was aware of Maitland-Niles.
"I don't feel comfortable talking about him, because nobody has officially told me that he is our player," said Mourinho, via Football Italia.
Need a VPN? Or seeking to switch? Then support Tribal Football by clicking here to sign up with our official partners NordVPN. Not only will you receive the best VPN experience, but also great discounts by signing up via Tribal Football. Thanks for your support!