"No plans to get back in the mix," Cuban wrote to ESPNChicago.com.
Cuban once was a candidate before the Ricketts family won exclusive bidding rights. But the exclusivity period with the Ricketts family has expired.
ESPNChicago.com's Bruce Levine quoted a source saying Sam Zell has reopened negotiations with a group out of New York led by Marc Utay, who is a former North Suburban Chicago resident, and Leo Hindery.
Utay's group had been one of the three finalists.