Asked what the future held for him, Hulk told Lancenet: "I will always continue to work hard and keep my feet on the ground, regardless of whether I stay at Porto.
"I have won many titles in the past four years at Porto, and I think that I have a great relationship with everyone.
"If the time has come to move on, I'll do so with a good feeling. I have enjoyed a great time here.
"I'm sure that they will understand the motives behind my decision if I leave."