When questioned about Saturday's events, Rush said "I haven't heard anything of it - [it was] all over after the final whistle".
"I'm not talking about it, [it] finished after the whistle," he added.
Northland Rugby Union operations manager, Kyal Collins, said that he had spoken to the parties involved and that the union were working through their processes to sort the situation.
"There was an ugly fight during the game [but] the referee was unable to pinpoint the instigators," Collins said.
"After the game there was an altercation [but] I'm not going to comment too much more, we're going through the relevant procedures.
I understand that a lot of it was dealt with after the game, [with] people apologising ."
Collins noted that no individual players were cited, as the referee had not issued any red cards, but there was serious etiquette issues which management of both sides will be asked to address.
"We're certainly not advocates for fighting," he said.