nrl head of football todd greenberg said the match review committee would ` look very closely at ' the canterbury forwards ' behaviour .
graham argued with referee gerard sutton for awarding souths a penalty .
klemmer was sin-binned for yelling ` you 're off your f **** ing face , ' at the ref .
both could have could have contrary conduct and detrimental conduct charges referred straight to the nrl judiciary .
highest charge carries 525-demerit point penalty and five-game ban .
it comes as nrl heads slam spectators who threw bottles at referees .
police have not laid charges , but two men have had their details taken .