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Local media also reported that Guildford had verbally harassed a Cooks Islands national representative triathlete while under the influence of alcohol when he was in the islands.
"From an employer's perspective, the events in Rarotonga have been incredibly disappointing and Zac needs to be accountable for his actions," NZRU general manager of professional rugby Neil Sorensen said in a statement.
"This will involve Zac going through our misconduct process over the coming weeks.
"However, it is fairly clear that there are some very big issues involved here, and rugby cannot provide all the solutions on our own.
"We are working with a professional counselling organisation which will provide guidance and input as to the next steps for the coming days, weeks and months."
The 22-year-old Guildford, a member of New Zealand's World Cup winning squad, has previously come under fire for drink-related incidents while in camp with the All Blacks and he said he had a problem with alcohol.
"The last few months I have had a bit of a problem with drinking and I need to address that, and all I can do now is move forward and put some positive steps in place with a good support group I have," Guildford told reporters at Auckland airport.
"My actions were not that of a professional sportsman, which I'm disappointed with. I just want to get home and sort myself out."