McTominay scored for Napoli in Friday night's win against Cagliari to confirm themselves as title winners.
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The former United midfielder was also named Serie A Player of the Year on the night.
Taking to social media, Fernandes sent a message to his old teammate: "Congrats my friend.
"Resilience, discipline and determination have always been there from you! Now with confidence your qualities are shining more than ever. Enjoy your moment."