The 25-year-old is keen on a move to England but Porto's asking price of €100m (£87.6m) could prove a stumbling block.
"Porto value me at €100m and that would be a world record transfer, but I prefer to do my talking on the pitch with humility and the desire to always prove myself," said Hulk.
"There are rumours that clubs in England and Italy are interested in me, but I will only concentrate on Porto. If something has to happen in January or at the end of the season then it will happen."
The Brazilian striker has scored five goals for Porto so far this season.