"We are aware of the media reports involving Jeff Withey," the Jazz said in a statement released Thursday. "At this point, we are collecting information and will have no further comment until we have a better understanding of the situation."
Manhattan Beach police spokesman Sgt. Tim Zins told The Associated Press on Thursday that detectives are investigating the allegations.
TMZ reported that Kennedy Summers, a former Playboy Playmate whose engagement with Withey was broken off in October, made the allegations to the Manhattan Beach Police Department on Tuesday when the Jazz were in Los Angeles for their first-round series against the Clippers.
No charges have been filed in the case as of Thursday afternoon.
"Given the ongoing circumstances, our client now needs to protect herself and come forward about everything so this doesn't happen to her or others in the future," publicist Zack Teperman said in a statement, according to The Salt Lake Tribune.
Withey's attorney released a statement later Thursday saying the "salacious and patently false allegations appear to be nothing more than a vicious and calculated attempt by an angry former girlfriend to damage Mr. Withey's good reputation."
"It is no coincidence that these fabricated claims conveniently come during the middle of the NBA playoffs, or that TMZ and the police department were notified on the same day," Alan Jackson of Werksman Jackson Hathaway & Quinn in Los Angeles, said in the statement. "There is no truth to the accusations, and when the facts come to light we are confident that the falsity of the claims, and the true motivations of the person behind them, will be exposed."
Withey, 27, has played a bigger role than usual in the playoffs. Utah starting center Rudy Gobert was injured on the opening possession of the series and has not played since because of a hyperextension and bone bruise of his left knee. He has been ruled out of Game 3.
Withey has averaged 2.5 points, 2.0 rebounds and 9 minutes during the first two games of the series. Coach Quin Snyder was noncommittal when asked about Withey's status for Friday's Game 3.
"At this point, we're researching it," Snyder said of the allegations after Thursday's practice, according to The Salt Lake Tribune. "We're looking at what the situation is. It would be irresponsible for me to comment beyond that until we have more information."