Luigi revealed on Friday that the Blues had enquired about Oscar's availability and stated that the two clubs remained far off in terms of a deal for the 20-year-old, with the Premier League club understood to have offered €25 million (£19.6m).
The Internacional chief has now given a strong indication that Chelsea's offer was rejected as the Brazil international will not be sold on the cheap.
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"But it must be an offer which represents a substantial boost to Internacional's financial resources.
"The figure I am looking at is nothing more, nothing less, than the biggest transfer in Brazilian football to date."
Former Brazil international Denilson currently holds the record for the most expensive transfer in Brazil after joining Betis from Sao Paulo in 1998 in a deal worth €33m (£25.9m).