Shane Flanagan says Clint Gutherson's arrival at St George Illawarra won't stall Tyrell Sloan's development, insisting the NRL club's key off-season recruit can help the Dragons flyer reach new heights.

The acquisition of ex-Parramatta captain Gutherson is the Dragons' most-significant off-season signing after the Red V terminated the contract of skipper Ben Hunt.

Flanagan on Friday said that Gutherson had already shown his commitment to the Dragons by renting a holiday home near to the club's training base in Wollongong.

The Dragons coach said unless something "drastically happens", Gutherson would be his fullback come round one.

That declaration will raise concerns over Sloan's future given the fullback has shown the potential to be the club's long-term No.1.

But rather than being disheartened, Flanagan explained the 22-year-old Sloan was excited at the prospect of shadowing Gutherson.

"I've spoken to Tyrell and 'Gutho' is only going to help him develop," he said.

"When I had discussions with Tyrell I could feel a bit of excitement in his voice when we told him (Gutherson) was coming, which was surprising.

"He hasn't had that mentor in our backline who can teach him. Sometimes it's great to hear it from another player.

"Tyrell is going to play fullback, wing, maybe even centre because he's a quality young players.

"He'll develop and hopefully with Gutho here, he'll develop a little bit quicker."

George Clarke - AAP