Wellington - A complaint of "match day misconduct" against the Stormers was under investigation following the Super Rugby team's win over the Hurricanes, SANZAR said on Wednesday.
The southern-hemisphere rugby body did not specify the nature of the alleged misconduct in a brief statement but New Zealand media reported it related to verbal abuse of officials during the match in Palmerston North.
"As this matter is before a SANZAR judicial officer, no further comment will be made at this time," it said.
The Stormers won the fiercely contested game 18-16 for their first away win of the season.
Fairfax Media reported that Stormers management were unhappy with some of the refereeing decisions and made their feelings known to officials.
The Stormers are in 10th place on the Super Rugby ladder and play the Waratahs in Sydney on Saturday.