Police Commissioner Charles Ramsey told The New York Times a woman claims she was sexually assaulted in a hotel suite where Blatche was present early Tuesday, but added he is not being accused of any wrongdoing.
"From all accounts, he was not personally involved in any kind of assault or anything like that," Ramsey told the newspaper. "He was there but he was not involved."
The Nets issued a statement indicating they were aware of the police interview but otherwise didn't comment.
Ramsey said Blatche and two other men were with three women in a suite at the Four Seasons Hotel. One of the women present, whom police described as very intoxicated, claimed she was sexually assaulted by the one of the men and was taken to a hospital to be examined for signs of rape.
Neither of the other men were members of the Nets' traveling party, the Times reported.
Blatche, 26, is averaging 11.1 points and 6.1 rebounds per game over 34 contests for the Nets this season.