A Sydney inmate has been charged over his alleged involvement in a kidnapping and the theft of luxury cars worth over $800,000.

The 21-year-old man was arrested at Silverwater jail at 9.20am yesterday, with police alleging he stole cars to supply vehicles to organised crime groups.

The investigation started on February 27 after police officers in the North Parramatta area saw three men running from a car while wearing balaclavas.

Officers searched the car and allegedly uncovered mobile phones, duct tape, flexi cuffs and a baseball bat. 

All three men have since been charged over their alleged role in the kidnapping.

They remain before the courts.

In May, police allegedly linked the 21-year-old man to “having a direct involvement” in the theft of a Haval vehicle, which was to be used in the kidnapping at Parramatta.

Investigators also allege the man stole a Rolls-Royce and a Bentley, worth over $800,000 combined, in March.

The man was charged with aggravated breaking and entering, stealing over the value of $60,000, taking and driving a car without consent and other offences.

He was remanded in custody and appeared in Parramatta Local Court yesterday.