Dolphins winger Jack Bostock has his sights on a positional move but moving from the club that backed him as a teenager is not on his agenda.

The 21-year-old was Dally M rookie of the year in 2024 after a breakout season. He was signed to the Dolphins as a 19-year-old in late 2022 around the same time halfback prodigy Isaiya Katoa inked his deal.

Both players were regarded as potential club "lifers" and Bostock ideally wants to realise that goal. Bostock, formerly in the St George Illawarra system, played centre for the Illawarra Steelers in the SG Ball Cup and has the desire to switch to the position in future and emulate the feats of his current centre partner Herbie Farnworth, also an England international.

"It has been good playing outside Herbie. Obviously he is a great player and back-to-back (Dally M) centre of the year," Bostock said.

"He will always help me out where he can. He started his career on the wing and one day I would like to transition into the centres. I am taking stuff out of his game and he helps me along the way. One day (I would like to play centre) but I am happy on the wing for now."

The former NSW under 19 representative, signed at the Dolphins until 2027 and boasting 18 tries in his 33 NRL games, elected to get out of his comfort zone when he joined the club. The opportunity to start and possibly finish his career at a new franchise held immense appeal.

"It would be great to stay here (for life)," Bostock said.

"We have a lot of young boys, not just Izzy (Katoa), and a few who haven't played NRL but will for a long time so I'd love to stay here and keep building on what we've done the last three years.

"I grew up in the Illawarra and I'd never moved away from home. Me and my old man came up and met with (former recruitment boss) Peter O'Sullivan and (former coach) Wayne Bennett.

"Wayne sold the dream. I've loved it ever since. I knew what Wayne had done in the past and I wanted to be a part of it."

The Dolphins take on the Sydney Roosters at Suncorp Stadium on Friday night in Magic Round, chastened by their most recent loss.

The side collapsed in a heap in the second half of their 40-28 defeat to Canberra last week after securing three wins in a row.

Throwing away a 28-18 halftime lead, Bostock said they had learned a harsh lesson about what happens in the NRL when a team switches off.

In team news, named prop Felise Kaufusi (knee) and utility Kurt Donoghoe (calf) will need to prove their fitness at Thursday's captain's run to play the Roosters.