The NRL integrity unit is investigating reports up to 12 St George Illawarra Dragons' players attended an alleged party at Paul Vaughan's house.

A Fox Sports report has named 11 of the players who were in attendance at the party. The players reportedly were Paul Vaughan, Josh McGuire, Jack Bird, Blake Lawrie, Corey Norman, Kaide Ellis, Matt Dufty, Gerard Beale, Josh Kerr, Daniel Alvaro and Zac Lomax.

The NRL are still yet to make an official statement on the matter, however, it's understood all players in attendance received a fine after police were called to the residence following a noise complaint.

Of the players named, only Zac Lomax didn't play in the Dragons' first grade side on Friday evening in their win over the New Zealand Warriors.

The Dragons released a statement this morning confirming they are aware of a biosecurity breach involving a number of players and an investigation will now be undertaken with the NRL Integrity Unit and NSW police.

Last year Vaughan was stood down for 14 days and handed a $10,000 fine for breaching the NRL bubble by attending a cafe without signing in.

NRL players are subject to Level 4 biosecurity protocols which means they must stay home and can only leave the house to go to training or buy groceries.

The Dragons do not play again until July 16 and it is unclear if sanctions will be imposed before then.

Previous breaches in protocols have resulted in fines and suspensions.