Porto president Pinto da Costa will not budge from star striker Hulk's £83.5million buyout clause, but fears a club will eventually be prepared to meet the asking price of the Chelsea target.
Skysports.com reports how the 25-year-old Brazilian is one of the most in-demand forwards in all of Europe, and has attracted additional attention from Paris Saint Germain, and big-spending Russia outfit Anzhi Makhachkala.
Blues boss Andre Villas-Boas is a known admirer of Hulk's having worked with the South American star during his time in Portugal. It is also believed that he would favour a move to Stamford Bridge in order to link up with his former manager.
Hulk is under contract at Estadio do Dragao until 2016, and Porto chief Da Costa has stood firm over his transfer demands.
"I hope that nobody meets Hulk's buyout clause, but I would not be surprised if someone pays it one day," he is quoted as saying in the Sunday Star.
Meanwhile, Chelsea have today announced the signing of Gary Cahill from Bolton Wanderers for an undisclosed fee, believed to be in the region of £7million.
The transfer had been expected to go through for some time, but negotiations were prolonged due to the England international defender's excessive wage demands.