phil hughes cricket
Phil Hughes of South Australia falls to the ground after being struck in the head by a ball during day one of the Sheffield Shield match against New South Wales at Sydney Cricket GroundGetty

Australian cricketer Phil Hughes remains in a critical condition and is undergoing surgery after he was knocked out by a bouncer at the Sydney Cricket Ground (SCG).

The incident took place at 2:23pm local time in the Sheffield Shield match between South Australia and New South Wales. Hughes was trying to hook Sean Abbott's bouncer, which he missed and the ball hit the side of his helmet.

The 25-year-old collapsed, face first, onto the pitch and the ambulance rushed to the field as he was taken to Sydney's St Vincent's Hospital in an induced coma at 3:30pm.

"Phil Hughes has been taken to a nearby hospital via ambulance. A full statement on his condition will be made once assessed by Doctors," New South Wales tweeted.

St Vincent's Hospital spokesman David Faktor said: "He arrived in a critical condition and remains in a critical condition. He is undergoing surgery as we speak.

"When he arrived he underwent a set of scans to establish the extent of his injuries and then a decision was made to perform surgery. All I could confirm is that he did sustain a head injury and that he is in a critical condition at the moment."

A NSW spokesman said the update on Hughes' situation will be given shortly.

"Phil Hughes has been taken to St Vincent's hospital and clearly the priority is Phil's health. We want to keep his family fully informed," he said.

"We don't have any update on his health at the moment. Dr Orchard the doctor on duty has gone with Phil to the hospital and when he is in a position to he will provide a statement on his condition. Until then we can't say any more."

The match between New South Wales and South Australia has now been abandoned after Hughes was hit by the ball on day one.

"The #BupaSS match between NSW and @WestEndRedbacks has been abandoned," NSW confirmed.