Cricket Australia has confirmed that the current round of Sheffield Shield matches have been abandoned after Phil Hughes was hospitalised with a serious head injury on Tuesday.

Hughes was hit by a Sean Abbott delivery while batting for South Australia against New South Wales at the Sydney Cricket Ground, and was quickly rushed to hospital for emergency surgery, with medical officials revealing that the 25-year-old remains in a critical condition.

Cricket Australia's executive general manager of team performance Pat Howard told members of the media: "We've spoken to players and the ACA, and given how players across the country are feeling right now, it's just not the day to be playing cricket and we understand that.

"We are continuing to offer all players and match officials counselling and support at this difficult time.

"Phillip Hughes continues to receive the best possible medical care. The thoughts of his teammates and the wider cricket community are with Phillip and his family and friends at this difficult time."

An update on the batsman's condition is expected following scans on Wednesday.