Duke head coach Mike Krzyzewski says he's not sure if a rape allegation against one of his former players is "true or not” and he didn't know about the accusation until hours after it became public Friday. 

Meredith Watson, the second woman to come forward to accuse Virginia Lt. Gov. Justin Fairfax of sexual assault, said in a statement released by her lawyer that she was raped two decades ago by an unspecified Duke basketball player. Krzyzewski responded to that allegation for the first time after Duke defeated Virginia 81-71 Saturday night.

"I think there was an allegation made, right?” Krzyzewski said. “So, I'm not sure if it's true or not, but there is an allegation. I did not find out about until late last night. I had no knowledge. That (allegation) is hugely important and our university will take care of whatever actions and give whatever information that is needed."

A person with knowledge of the alleged sexual assault told USA TODAY Sports that the incident occurred in 1999, a year before Watson said Fairfax sexually assaulted her when both were students at Duke. That person was granted anonymity because details of the incident have not been made public. 

Nancy Erika Smith, Watson’s attorney, wrote in a statement Friday that Watson “went to the dean, who provided no help and discouraged her from pursuing the claim further.”