Porto striker Hulk's £83 million release clause represents good value, according to the player's agent.
The Brazilian netted 23 goals in the Primera Division last season, as Porto went the season unbeaten domestically under Andre Villas-Boas.
Villas-Boas, who also became the youngest manager to win a UEFA competition when he captured the Europa League with the Portuguese champions last season, moved to Chelsea in the summer, with the west Londoners one of many clubs reportedly interested in Hulk's services.
"Hulk is one of the best players in the world and he is being followed by big clubs in Europe," his agent,"Teodoro Fonseca told Radio Renascenca.
"One hundred million euros is not such a high figure. Every European club knows that the money spent on him would be compensated by his talent.
"A Chinese club is already paying £8.4m per annum to an athlete and some Russian clubs are already paying £16.8m."
Despite constant reports linking the 25-year-old, whose contract at Estadio do Drago runs until 2016, with a move to Stamford Bridge, Fonseca said a fortnight ago no contact had been made between the two clubs.
“I have not spoken to anybody from Chelsea. Villas-Boas knows the footballer and Porto well," he said.
“Every day I receive calls from agents but the only serious offers we have received were three last season, offering him a better salary than at Porto.
“But Hulk rejected them because of sporting motives. He is not just interested in money but challenges on the pitch.
“I admit Hulk can’t stay at Porto forever,” he added. “That is football and at the moment the clause in his deal is decisive.”
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