The agent for All Black Zac Guildford has confirmed he was involved in an alcohol-fuelled altercation at a house in Christchurch.
Guildford has voluntarily stood down from the Crusaders' Super Rugby side following the late-night incident at the weekend.
The New Zealand Rugby Union has begun a misconduct investigation and will meet with the 23-year-old later this week.
Guilford's agent Simon Porter on Monday would not say if the confrontation was violent. However, no complaint would be laid with police.
Mr Porter said Guilford wants to keep playing rugby, but realises that he may need to step away to resolve underlying issues. He said Guildford is seeking professional help.
In 2011, the Crusaders and All Blacks winger was suspended for four weeks after claims that he punched patrons at a bar in Rarotonga while intoxicated, bleeding and naked.
Crusaders coach Todd Blackadder believes Zac Guildford needs professional help, because the support and help he has received so far has not worked.
NZRU chief executive Steve Tew has said his union and the Crusaders are very disappointed by the incident, but declined to comment further.
The Super Rugby season begins on 15 February.