The powerful Brazilian has refused to commit his future to the Portuguese champions and said that there are a number of clubs monitoring his situation
The Brazil international's future at the Estadio do Dragao has been called into question again since the 25-year-old's agent said earlier in the week that 'this is the right moment' for the player to move on.
Chelsea and Paris Saint-Germain have been credited with an interest in the striker, who has become a major prospect since joining the club from Tokyo Verdy in 2008.
Hulk wished to distance himself from the speculation, but did not rule out the possibility of a new challenge.
"I do not know yet what my future will be like," he told reporters. "I have four years left on my contract and my agent is talking to Porto.
"If I have to leave, I will take this club in my heart. If I stay, I will be 100 per cent committed.
"I try not to focus too much on a transfer, although I hear what is being said - I know there are interested clubs, but I do my best for that not to affect me."
The Brazilian forward has a €100 million release clause attached to his Porto contract, which expires in 2016.