The NRL is investigating after a Warriors player allegedly used a homophobic slur during the New Zealand club's 25-24 golden point win over the North Queensland Cowboys on Friday night. 

The incident was recorded by broadcast microphones in the 60th minute of the clash, where an unknown Warriors player appeared to call Cowboys winger Kyle Feldt a "f****t" as he laid on the ground with an injury. 

Feldt was on the ground after being tackled by Warriors winger Marcelo Montoya, who had been penalised for high contact on Peta Hiku. 

As the Warriors debated the decision with the referee, a player can be heard saying: "Get up Kyle you f****t." 

An NRL spokesperson told AAP they were "aware and investigating" the incident. 

Speaking shortly after hearing about the incident, Warriors coach Nathan Brown admitted he wasn't aware of the details but said the club will "certainly check it out". 

"I'm not across it," Brown told Newstalk ZB's Elliott Smith. "I woke up at five o'clock this morning and saw the headline so I'll have to see what the story is there. I wasn't quite aware of it at all to be honest." 

A player can be charged with contrary conduct if the NRL can prove who said the slur. 

Back in 2014, Mitchell Moses of the Tigers was banned for two games for a homophobic slur at Raiders lock Luke Bateman. 

A grade one contrary conduct charge carries a $1000 fine, with an early plea if it is the first offence. A grade two and three charge is a one and two-match ban respectively.