The tricky forward, who was 29 on Friday, was linked with a move back to Santos but appears to have dismissed reports about his future by reaffirming his commitment to the Rossoneri.
"I'm happy to be here for my 29th birthday," he told Milan Channel. "I'm happy here at Milan and I hope I'll be here for another five or six birthdays.
"The best present would be three points against Atalanta on Sunday. I hope that I'll play well against Atalanta. Winning that match would really be a great gift.
"I have more experience now than during my younger years but the mentality is the same."
Milan have also announced two new deals as they finally confirmed the club has acquired joint-ownership rights to Genoa duo Kevin Constant and Francesco Acerbi.