A man has been taken to hospital after being shot in the leg in Sydney 's south-west overnight.

Around 7.15pm last night, emergency services were called to Old Kent Road in Greenacre after residents reported hearing gunshots.

Officers were later told an unknown person had fired multiple shots at two men in a driveway.

About the same time, police were called to Bankstown Hospital following reports that a 26-year-old man arrived at the emergency department with a gunshot wound in his leg.

Crime scenes were established at Greenacre and Bankstown Hospital, and police commenced an investigation into the circumstances surrounding the incident.

As inquiries continue, police have released CCTV footage of a male wearing all black clothing, including a face covering, and a grey Audi Q3

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