Phil Hughes remains in a critical condition in hospital after undergoing surgery on a head injury.

The 25-year-old Australian batsman was struck by a short-pitched ball while batting for South Australia against New South Wales at the Sydney Cricket Ground yesterday.

Hughes was taken to hospital where he was placed into an induced coma, with team doctor Peter Brukner revealing that "Phillip's condition is unchanged and he remains critical".

Cricket Australia confirmed earlier today that the current round of Sheffield Shield matches have been abandoned.

Meanwhile, helmet manufacturers Masuri have asked for as much TV and video footage of the incident as possible in order to reduce the risk of a repeat.