An alleged failure to inform the NRL integrity unit of a drink-driving conviction looks set to impact Luciano Leilua's start to life at new club St George Illawarra.

Leilua, who moved from the North Queensland Cowboys to the Dragons earlier this month, was on Thursday hit with a breach notice by the NRL.

It leaves the forward facing a potential suspension which could rub him out of the start of the 2024 campaign.

The back-rower was suspended from getting behind the wheel and handed a $300 fine earlier this year following a low-range drink-driving conviction.

But the Samoa international's alleged failure to tell the integrity unit and Cowboys about the conviction could come back to haunt him.

Leilua will be given five days to respond to the breach notice, which could lead to him missing the start of the Dragons' season.

The 27-year-old only signed with St George Illawarra last Friday and was likely to make Shane Flanagan's best 17 ahead of their round one clash away to the Gold Coast Titans.

"The Dragons were fully aware prior to signing Leilua of a potential breach to be delivered," St George Illawarra said in a statement on Thursday.