Darren Sharper, 38, was arraigned on Thursday. He had been free on $200,000 bail, but that was increased to $1 million, which he posted after the hearing.
He faces multiple felony charges related to the alleged rape of two women he met at a West Hollywood nightclub. Authorities say the assaults occurred in October 2013 and January of this year.
Officials say there may be more victims in other jurisdictions. According to prosecutors, Sharper is being investigated in three more states and a recent allegation has surfaced in Miami.
His attorneys say he will claim that any sexual contact was consensual. He is due back in court on April 15.
Sharper played 14 seasons in the NFL from 1997-2010 with Green Bay, Minnesota and New Orleans. He retired after the 2010 season.
The Associated Press contributed to this report.