All Blacks winger Zac Guildford has voluntarily withdrawn from Canterbury Crusaders' preparations for the new Super Rugby season after being involved in a late-night incident in Christchurch last weekend.
The 23-year-old, who has been capped ten times for New Zealand, admitted his involvement in the incident after a private house party which is now being investigated by his team and the NZRU.
Guildford was banned for four games and ordered to undergo alcohol counselling after a naked, drunken rampage in the Cook Islands in Nov. 2011.
He previously apologised for his "excessive drinking" and narrowly escaped a playing ban at the 2011 World Cup after an alcohol-related incident prior to the tournament beginning.
"We and the Crusaders were very disappointed to learn of this incident. As a result, the NZRU has initiated misconduct proceedings against Zac," NZRU chief executive Steve Tew said in a statement.
"We will be meeting with Zac and his representative in the following week to discuss the matter, and next steps.
"As his employer, we want to ensure that the process respects Zac's right to a fair hearing so we do not wish to comment further at this stage."