The transfer saga surrounding the Portugal international came to an end this week after the forward sealed a move to Juventus.
"Farewells hurt and even more when they're for a player like you," the goalkeeper wrote on Twitter.
"I want to thank you for what you have done for the club, which you made even greater than it already was.
"Congratulations for succeeding in your quest to become the best.
"I wish you lots of luck on your new journey."