"It's not accurate," Cuban told Brad Townsend of the Dallas Morning News. "We have not discussed him in a trade at all. Has not happened."
Cuban also voiced displeasure with an anonymous source who took aim at Porzingis' defensive shortcomings in a report by Jake Fischer of Bleacher Report earlier this week.
"We are not happy that there is a supposed 'Western Conference exec' ripping on one of our players," Cuban said. "There is no trade discussion. I think they just used it as a way to put out there what they think of KP."
While Porzingis has struggled as an interior defender this season, he remains the Mavericks' second-leading scorer and rebounder at 20.5 points and 8.2 boards per game. The 25-year-old missed the first nine games of the campaign after undergoing offseason knee surgery.
Porzingis will sit out his second straight contest Tuesday due to a sore back.