Josh Giddey will not face charges after police in California dropped an investigation into the Australian NBA star’s alleged relationship with a minor.

Giddey was the subject of an NBA and police probe following an allegation in November that the Boomers guard had been in a relationship with an underage girl.

California’s Newport Beach Police Department (NBPD) on Thursday confirmed the case was closed.

“Our detectives have reviewed all of the available information regarding allegations circulating on social media and were unable to corroborate any criminal activity related to Mr Giddey,” NBPD crime prevention specialist Heather Rangel said.

The NBA is yet to comment on the matter, commissioner Adam Silver saying in December the league wouldn’t take action until the police investigation concluded.

In a since-deleted post, an anonymous social media user said a girl seen with Giddey in videos and photographs was a high school junior at the time.

The social media account has since been deactivated.