Embattled American football star Darren Sharper's release request from a Los Angeles jail has been denied as authorities continue to investigate multiple rape accusations across the U.S.

The retired sportsman has been behind bars since turning himself in to California cops on 27 February (14), after an arrest warrant was issued by prosecutors in New Orleans, Louisiana in connection to two allegations of rape, which reportedly took place in September (13).

He has yet to be formally charged in the Louisiana case, but his legal woes escalated on Wednesday (12Mar14) when officers in Arizona slapped him with two counts of sexual assault relating to claims he drugged and attacked two women there in November (13).

The former Green Bay Packers star returned to Los Angeles County Superior Court on Thursday morning (13Mar14) and asked a judge to free him from custody and allow him to remain on house arrest - but the motion was rejected as a result of the Arizona charges, which are "non-bondable".

The 38 year old was ordered to remain behind bars until his next hearing, which is set for 24 March (14).

Sharper has already pleaded not guilty to claims he drugged and then raped two females in L.A. If convicted in that case, he faces more than 30 years behind bars.