The 25-year-old Portugal man has been linked with Man Utd and Tottenham.
“It’s a pride for me and a recognition of my work. I have been trying my best to do what is best for the club,” the midfielder told jornalists.
“It is for what I did on the pitch, but also showed that I liked Sporting and took pride in representing the club.
“For me it is, and always will be, a privilege to be here and be able to wear the Sporting jersey.”