A decision over Hulk's future at Porto is expected by Wednesday.
The Brazilian centre-forward is a target for Chelsea, Tottenham and Zenit St Petersburg.
Porto media chief Ahaz Fellegger told Record: "Everything will be decided before the 31st. Hulk has told his agent, Teodoro Fonseca, he wants everything cleared up between Tuesday and Wednesday.
"So that's what we want to see happen."
For all the latest football news go to tribalfootball.com.