"Mr. Dauman is pleased to cooperate and fully prepared to comply with the request for appropriate and legally relevant information in the California proceeding," attorneys for Dauman said.

A New York judge on Thursday ruled that Philippe Dauman must allow himself to be deposed about the mental state of Sumner Redstone, something the Viacom CEO had been trying to avoid.

Thursday's ruling, the latest decision in the ongoing drama pitting 92-year-old Redstone against former girlfriend Manuela Herzer, indicated Dauman should make himself available for at least one day within the next 30 days.

Herzer is suing Redstone because he removed her as his health agent and instead installed Dauman, who has maintained Redstone was mentally fit enough to make such a decision while Herzer says he was not.

Meanwhile, Redstone's lawyers are suggesting Herzer is motivated by money, since she stood to lose an inheritance of $50 million cash plus Redstone's $20 million home in Beverly Hills until the media mogul removed her from his estate plan the same day he altered his health directive.

Dauman has acknowledged Redstone's speech impediment but has called him "engaged and attentive" and also says he was making sound business decisions until he recently stepped down as Viacom's executive chairman. He was replaced by Dauman.

Dauman's attorneys had argued from New York, where he resides, that a written declaration from Dauman in November was sufficient and therefore he should not be made to sit for a deposition, but the judge on Thursday sided with Herzer and against Dauman.

"Mr. Dauman is pleased to cooperate and fully prepared to comply with the request for appropriate and legally relevant information in the California proceeding," Dauman's attorrneys said in a statement issued on Thursday.

Judge Kathryn Freed's decision could be a moot point, though, if a Los Angeles judge decides on Monday to dismiss the lawsuit.