United meet De Gea and Fiorentina on Saturday at Old Trafford in their final preseason friendly.
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After a short message from the former United goalkeeper on social media, Fernandes delivered a response.
"David, my friend, I can't wait to see you at the Snapdragon Cup," he said through club channels. "I hope you enjoy being back at Old Trafford, to see your fans, your house, your home.
"At the same time, I hope I score some goals against you and we enjoy the day together!
"See you soon, my friend."