The NRL will consider bringing back five-minute sin bins for clearly defined offences such as slapping after a spate of professional fouls in the second week of the finals series.

NRL head of football Graham Annesley hinted he would be open to the idea being debated at the end-of-season competition committee meeting, which will also attempt to simplify a number of rules.

But after Manly forward Jake Trbojevic was sent to the sin bin for 10 minutes for tugging the jersey of Rabbitohs speedster Dane Gagai, the NRL is willing to wind back the clock with the old-school punishments.

The Sea Eagles surrendered a six-point lead while Trbojevic was off the field and were eventually dumped out of the finals series, a decision Manly coach Des Hasler still disagrees with.