"I never purchased or have been involved in any way with Dean Foods," Icahn said. "While I have obviously heard of Phil Mickelson, I have never spoken to him or met him."
Icahn, Mickelson and sports gambler William Walters are targets of an insider-trading probe by U.S. authorities, the Wall Street Journal reported, citing people briefed on the investigation. The probe is looking at large option trades in the days before Icahn's $10.2 billion offer for Clorox in July 2011, as well as trading patterns related to Dean Foods, the Journal said.
Icahn, 78, has "never given out inside information," he said. "We are always very careful to observe all legal requirements in all of our activities. We believe that making inflammatory and speculative statements, especially when we've had an unblemished record for 50 years, is completely irresponsible on the part of the Wall Street Journal."
Mickelson, 43, denied any wrongdoing and said he is cooperating with the government.
"I have done absolutely nothing wrong," Mickelson said Saturday. "I have cooperated with the government in this investigation and will continue to do so. I wish I could fully discuss this matter, but under the current circumstances it's just not possible."