Tony Clubb has been suspended by Wigan Warriors while the club investigates the allegation of racial abuse aimed towards Andre Savelio.
The Hull FC forward made a complaint to the referee during the Warriors' victory over the Black and Whites, with Savelio accusing Clubb of making the remark.
A joint club statement confirmed both would work together to get to the bottom of the incident.
Clubb was brought off after 17 minutes during the game and didn't return to the field, though head coach Adrian Lam strongly denied that the allegation was anything to do with that.
Wigan Warriors executive director, Kris Radlinski, added: "There is no room for racism in sport in any form and we take the accusations made by Hull's Andre Savelio very seriously.
"Our immediate intention is to work closely with Hull and the governing body to gather all the facts and support the investigation process that is in place.
“In the short term, Tony Clubb will be suspended from all Club activities. Tony's evidence will be taken into consideration by all parties moving forward and his welfare will remain a responsibility of Wigan Warriors throughout the investigation."
Hull FC chief executive, James Clark, added: “Andre has the full support of everyone at our club and we will work hard to ensure this incident is thoroughly investigated and that his voice can be heard. Racial abuse is not acceptable in any form.
“This is obviously an emotive and highly personal subject, and he has access to the best possible welfare network should it be required.
“A zero-tolerance approach to all forms of abuse is prevalent in Rugby League - we are a welcoming sport that prides itself on its core values of inclusion, community, diversity and respect.
“We would also like to note the professional, transparent and sympathetic approach to the handling of this matter by Kris Radlinski and Wigan Warriors.”
