Zappacosta has confirmed his loan will not be extended for Roma's Europa League campaign this month.
He posted to social media: "Hello Roma! These have been difficult months for everyone. I am grateful for this experience. For this I thank the management, my companions and all the people I have known.
"Special thanks go to the medical staff, physiotherapists, and the guys who helped me recover from my bad injury.
"Good luck to everyone and everything, on and off the field: thanks Roma!"
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