Anthony Seibold has confirmed he will give Jamayne Isaako the first shot at playing fullback next year where he believes his attacking game can be a real threat.

The Brisbane mentor has also detailed why he wants Darius Boyd in his team and outlined how the dual premiership winner will be training at centre and wing this pre-season.

Isaako has regularly been training at fullback and will revert from the wing to the position where he made his NRL debut in 2017.

Teenaged flyer Tesi Niu, who starred at fullback for Tonga in the 14-6 win over Great Britain, will also be given an opportunity to train at fullback in the coming months.

Seibold said Isaako had all the makings of a quality custodian.

"Jamayne came to the club and was signed to the club as a fullback and it's time to look at him and see how he progresses in the position," Seibold said.

"He has the potential to be elite fit. The best fullbacks in the competition are elite fit and he has some potential, he is not there yet but he can be elite fit.

Another right side raid comes up trumps for Brisbane

"The other thing is, Jamayne showed some real signs when we did train him at fullback over the past 12 months that he has some real threat carrying the footy, whether it's in the backfield or on the back of shape. That's what we like about him so we are giving him the first shot."

Seibold has been thrilled with his progress of 18-year-old Niu and his training stint at fullback will be with an eye to the future.

"Tesi is still on our development list so he isn't eligible to play until the end of June. He is a player that we see with real NRL potential and... is the one who is really improving a rapid rate," Seibold said.

The Broncos back line is set for several changes with Anthony Milford likely to revert to five-eighth and partner Brodie Croft in the halves. Seibold said once he settled on his combination for next year he would stick with it in the short term.

"I think with all our positions, we have a lot of competition for spots, but whatever side we decide to go into round one with, it's really important regardless of results that we give that group six or eight weeks to really build cohesion and connection," he said.

"What we want to do is give everyone ample opportunity to put their best foot forward in pre-season."

Seibold said he wanted to give Boyd every opportunity to nail down an outside back position for round one. He also said that neither the 32-year-old former international nor any other senior players had been issued ultimatums in the wake of the 58-0 loss to the Eels in week one of the finals.

"Darbs has had reps at left centre. He will do some reps on the wing. He is a multiple-position player and he has played at the elite level for a long time," Seibold said.

"It's never come from me that Darius or the older guys are on notice or are going to play Queensland Cup. We said what needed to be said at the end of the year. I don't like the amount of information that comes out of our club, all the speculation, but that's the world we live in.

Five key match-ups of the Broncos' 2020 draw

"Darius is someone with a lot of deposits in the bank. We don't have too many guys who have won premierships in our club and he has won two. He is a special person off the field and he has an opportunity like all the other guys to put their best foot forward in pre-season. We want to give Darius the best opportunity to play first grade."

Boyd has 317 NRL games of experience and 31-year-old Alex Glenn, who recently re-signed for two season, has 259. It is just one reason why the duo are so valuable to the Broncos.

"We only have two guys over the age of 30 in our squad, Alex Glenn and Darius Boyd. Last year, we had the youngest roster in the competition, so… one of the reasons I was really keen to retain Alex was because of his experience," Seibold said.

"We have lost Matt Gillett, Macca [Andrew McCullough] is turning 30 this year but we only have two guys over 30 so that's not a lot of experience, but we have a lot of talent in our younger crew and we believe we have a sound mix."

When asked whether Boyd was staying on as captain Seibold said any decisions about the makeup of next season's leadership team would be kept in-house until announced in the coming weeks.

"There has been a bit of a speculation around the leadership group. We will announce our leadership group prior to Christmas and there will be some decisions in and around that. I'd rather keep the conversations I've had with Darbs private," he said.