Hulk has denied reports that he has held talks with Chelsea as speculation continues to link him with a move to Stamford Bridge.
The Porto and Brazil forward said he had "done nothing with Chelsea or any other club" and was concentrating only on playing for Brazil at the Olympics.
Hulk, 25, told Lancenet: "I have four more years on my contract with Porto, and I'm focusing on the national team.
"I haven't talked to anyone. As everyone knows, I don't follow negotiations closely as that will make me lose my focus. I let my agent deal with that stuff."
Porto president Pinto da Costa, speaking to reporters at a political event in Gaia, added that the club had yet to receive a bid for Hulk.
"I don't know why you ask me about Hulk and don't ask me about Helton, Moutinho, James [Rodriguez], Maicon and the others," he said. "Hulk is as close to leaving as the others. For other players, there have been some approaches. Until now, nothing has arrived for Hulk."
Porto are reported to want a fee of around €70 million for Hulk, who is also thought to be interesting Paris St Germain. He scored 21 goals in 38 appearances for the club last season, but is unlikely to leave unless the fee is reduced.
Speaking earlier this month, an insider told ESPN: "Porto's asking price of €70 million is simply unrealistic. They might take €60 million, although again that is far, far too high.
"There are many clubs interested, but none at that price, and there will not be a move this summer unless Porto are more realistic."