Alastair Cook
Cook would not be drawn on safety concerns in cricket after Hughes was hit with a bouncer. Getty Images

England captain Alastair Cook says his team are "in shock" over the head injury suffered by Phil Hughes after the Australian batsman was left in a critical condition in hospital having been hit by a bouncer at the Sydney Cricket Ground.

Hughes has been placed in a medically-induced coma after undergoing surgery, with the extent of his injuries not expected to be known for the next 24 - 48 hours.

As the world of cricket waits for an update regarding the 25-year-old's head injuries, England skipper Cook says his players are devastated at the news which has disrupted preparations for the start of the one-day series against Sri Lanka.

"The whole team has been in shock all day," said Cook. "All our thoughts and prayers are with Phillip and we've got guys from Worcestershire and Middlesex and quite a lot of us have played against him.

"It's a really saddening incident and fingers crossed he can show the same fight he's shown throughout his whole career and he can pull through.

"The whole dressing room is just massively concerned for Phillip. Our player safety is kind of irrelevant at the moment - it's all about him and his family and friends and we just want to send us our best from here."