New Zealand Rugby League (NZRL) is investigating allegations captain Jesse Bromwich and Kevin Proctor purchased cocaine.
Melbourne Storm forward Bromwich and Gold Coast Titans' Proctor are alleged to have bought the illegal substance outside a nightclub in Canberra in the wake of the Kiwis' 30-12 Anzac Test loss to Australia.
Neither man has been charged with an offence but were both named in court during an appearance of local man Adrian Mark Crowther, who is accused of selling cocaine to the pair and possession of four grams of MDMA.
A statement from NZRL read: "New Zealand Rugby League have been made aware of an alleged incident involving Kiwis Captain Jesse Bromwich and team-mate Kevin Proctor in Canberra following the ANZAC Test.
"We are working with the NRL while investigations into the alleged incident are on-going and New Zealand Rugby League will not be making any comment until more information becomes available.
"If the allegations are proven to be true New Zealand Rugby League will be taking action immediately."
Melbourne said they were making endeavours to speak to Bromwich while the Titans confirmed they had been made aware of the incident but will not be making any further comment until more information is available.
Melbourne Storm is aware of an allegation against one of its players. The Club is currently making endeavours to speak to the player (1/2)-- Melbourne Storm (@storm) May 6, 2017
and the NRL and will provide an update when appropriate. Until that point, the Club will not make further comment. (2/2)-- Melbourne Storm (@storm) May 6, 2017
The news follows that of Sydney Roosters star Shaun Kenny-Dowall allegedly being arrested for possession of cocaine.
Meanwhile, Cronulla Sharks announced that chairman Damian Keogh has resigned in order to "allow him to address allegations of possession of an illegal substance".
In a statement addressing what it described as the "number of serious matters involving the alleged use of illicit substances", the NRL said: "The NRL Integrity Unit will work with all the parties involved to understand the nature of the allegations and what consequences may flow under the NRL rules if the allegations are determined to be accurate."
"The game has taken steps over many years to highlight the risks associated with the use of illicit drugs," NRL CEO Todd Greenberg said.
"We will continue that work but ultimately individuals are accountable for their own choices, and the League's capacity to eliminate the use of illicit drugs by its participants faces similar challenges to that faced by society."