Hulk has appeared to pave the way for a potential move to Chelsea by suggesting it may be time for him to leave Porto.
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."
Hulk, who is contracted to Porto until 2016, added: "The club and its fans will forever have a place in my heart.
"I can only thank them for all the affection they've shown me."