Follow CBSMIAMI.COM: Facebook | Twitter

LOS ANGELES (AP) — Tennis star Maria Sharapova says she has failed a drug test at the Australian Open.

READ MORE: Fort Lauderdale Man Accused Of Sexually Assaulting Teen Girl

A five-time major champion made the announcement at a news conference Monday in Los Angeles.

Sharapova said she tested positive for meldonium, which she has been taking for 10 years for health issues. Meldonium became a banned substance this year.

READ MORE: Housing Crisis: County Mayors To Hold Roundtable On Skyrocketing Rents

The WTA has not announced a penalty.

Sharapova, currently sidelined with a forearm injury, hasn’t competed since losing to Serena Williams in the quarterfinals of the Australian Open in January.

MORE NEWS: 'Ride Of Silence' To Raise Awareness For Cyclists Safety On The Road

(© Copyright 2016 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)