Fairfax Media understands the projectile was believed to be aimed at departing Tigers five-eighth Mitchell Moses, which prompted an angry response from Sharks prop Andrew Fifita.

The Cronulla Sharks have continued their undefeated away run this season with a 22-16 win over the Wests Tigers, though there was early controversy over a disallowed try.

Vision of a riled-up Fifita was shown on the broadcast on Saturday night, later admitting in an interview with 2GB that he was defending Moses.

Moses has been heavily criticised by his own supporters after opting to sign with Parramatta next season.

He has also asked for several releases from his contract to link with the Eels this season, however the club won't let him leave until they find a replacement.

Moses has been one of the Tigers' best players since announcing his defection three weeks ago, however he was unable to recapture that form in the 22-16 loss to the premiers on Saturday night.

The Tigers and the police are looking through the footage and will continue to investigate.

The incident happened on a night the Tigers fans refused to hide their displeasure over the decision of Moses, Aaron Woods and James Tedesco to leave the club.

Despite the club sending an email to members pleading with them to respect their skipper, Woods was once again booed by his home supporters.

There were a number of banners erected taking aim at the players, with Woods called a "dog" and Tedesco a "cock" in reference to his expected defection to the Roosters next season.