ACT Brumbies scrumhalf Nic White needed surgery on a fractured jaw after he was king-hit at the Foreshore music festival on November 24.
The Brumbies have cleared the 22-year-old of any wrongdoing and claimed he was struck once from behind.
Brumbies chief executive Andrew Fagan said the Super Rugby club investigated the incident soon after it happened and that White didn't press charges with police because he didn't see who his attacker was.
''Nic was the victim of an unprovoked assault in which he was king-hit when struck once at Foreshore through no fault of his own,'' Fagan said.
''He didn't miss any training.
''He was back training with the boys in the days following and has been training with the group ever since.''
The Brumbies haven't imposed any punishment on White. Other Brumbies players were at the festival, however The Canberra Times was told none were with White at the time he was hit.
It was at the same festival where Canberra Raiders centre Blake Ferguson was ejected for spitting on patrons. There is no suggestion the two incidents are related.
Ferguson was fined $5000 by the Raiders and ordered to do extra community service work.
The Country representative was stood down for a game earlier this year for attending training under the influence of alcohol.
There were also allegations a bottle thrown from the apartment of Raiders second-rower Joel Thompson hit a cyclist during a Foreshore after-party. ACT Policing interviewed Thompson as the owner of the apartment, but he has told the Raiders he wasn't involved.
White's training is restricted because of a shoulder injury and he is yet to begin contact work.
The fractured jaw won't affect his availability for the Brumbies' season-opener against the Queensland Reds at Canberra Stadium on February 16.
White had a breakthrough season for the Brumbies, establishing himself as first-choice No.9 and earning a spot in the Wallabies' squad for the Tests against Scotland and Wales.