The NRL is investigating claims a Canterbury player threw a water bottle at an opponent in the dying moments of their worrying 28-10 loss to South Sydney.

An NRL spokesman said the match review committee would examine footage after a plastic water bottle appeared to be thrown from behind the goalline in the general direction of the Souths players.

As Rabbitohs prop Nathan Brown lined up to convert Joe Burgess' try on fulltime, a bottle appeared to be thrown from the Bulldogs huddle and land on the ground.

No Souths player was struck and it was unclear who threw it.

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Brown said while he did not see the bottle land, he was made aware of it by his teammates. "I didn't take any notice, but all the boys were saying someone threw a bottle or something," Brown said.

Asked if it came from the Bulldogs, Brown said: "I think so. I don't know about that one. That was a weird one."

Last year Souths prop George Burgess was suspended for two weeks for throwing a bottle at Sydney Roosters' Kane Evans.

The NRL took a dim view of the incident and Burgess was rubbed out of his side's week one finals loss to Cronulla.

"I didn't even take notice to be honest," Brown said.

"Someone said it was George after what he did last year.

"Everyone took it as a bit of a laugh."

- AAP