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Brett Finch.

The NRL is investigating a possible biosecurity breach by new Warriors consultant and ex-NRL half Brett Finch just one week after he joined the Kiwi club's COVID-19 bubble.

Finch was brought into the Warriors bubble by coach Todd Payten last week in an advisory role and joined the interim coach in the coach's box for Friday's tight loss to Penrith.

The former commentator has potentially breached the NRL's biosecurity protocols though after appearing on a Youtube podcast with YKTR Sports.

An image of Finch kissing the cheek of a YKTR panellist was published to Instagram by the podcast crew as it was being recorded on Thursday night, with the NRL confirming the matter was being looked into.

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"[Finch] has been isolated from the Warriors group until we get advice from our biosecurity experts," an NRL spokesman said.

The Warriors have been based at Terrigal on the Central Coast since May, with Finch joining them last week.

Speaking after his side's loss to Penrith on Friday night, Warriors coach Todd Payten detailed what it was like to have Finch in the coach's box.

"Loud ... He's been really good. I think having him in has been good for him as well. He likes to talk and that was probably the loudest box we've had for a while."

As per the NRL's biosecurity guidelines, those inside a club bubble are only allowed to leave for a small range of reasons including playing, training, and medical emergencies.