"This is devastating news for his family and for all of us in the Brumbies community. Our thoughts and prayers are with his family at this difficult time."

Australian Rugby Union chief executive John O'Neill said Mackay was "a credit to the game of rugby, and much loved by all who knew him."

Mackay, 26, was recruited by the Brumbies this season after spending the past five years playing rugby league in Sydney.

He was selected as a reserve for the Brumbies against the Sharks but came off the bench to play in his team's 14-35 loss in their Super 14 match last month.

He was struck by a car while returning to the hotel with teammates in the early hours of the morning.

The Brumbies defeated the Cheetahs 40-27 in their Super 14 match in Bloemfontein on Saturday, despite news of Mackay's condition clouding preparations.

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