Gov. Geraldo Alckmin said he was not confirming Cardoso's candidacy and that it was ultimately up to the former leader and their Social Democratic Party to decide whether he would run.
Cardoso served two terms -- from 1995 to 2002 -- as president. He is eligible under Brazilian law to pursue another office including the presidency.
There has been some speculation that Cardoso will throw his hat in the presidential ring in 2006, though he has not said he was a candidate.