The lawyer for Florida State quarterback Jameis Winston said Thursday two witnesses who were with Winston last year when an alleged sexual assault occurred will corroborate Winston's account of the event.

Tim Jansen told ESPN.com that Winston was being investigated for "his potential involvement" in an incident in December 2012. Jansen provided police with affidavits from two witnesses earlier this week, and he said at least one of those witnesses has already been interviewed by police and another is in the process of being interviewed.

David Northway, a spokesman for the Tallahassee Police Department, would not confirm nor deny that any interviews have taken place.

A source told ESPN's Joe Schad that as of Thursday morning, Winston had exercised his right not to speak to Tallahassee police or provide a statement to them in the investigation. Asked if Winston was prepared to cooperate with Tallahassee police, Jansen said Thursday afternoon, "We'll cooperate as much as we can."

Multiple reports have connected Winston to an incident on Dec. 7, 2012. Police have only said they are investigating the report of an alleged sexual battery on that date.

Jansen said he was told by authorities in February 2013 that the case was closed and relayed that information to Winston's family and Florida State. No charges were filed and Jansen said Thursday no investigation had occurred since then, until this week.

On Wednesday, Tallahassee police turned over the case to the state attorney, who asked police to further investigate the allegations.

Georgia Cappleman, chief assistant state attorney, said Thursday she could not speak to why there was a delay in prosecutors receiving the case. She also said there is no timeline for a decision on how to proceed with the case, though no decision is expected within the next few days.

Typically, a delay can result from a lack of evidence in a case, or a lack of cooperation from the accuser.