There will be no split loyalties for Bronco-to-be Israel Folau on Saturday night when Melbourne and Brisbane resume hostilities in the NRL's great modern-day rivalry.

The towering Storm winger had a rare off-day in last weekend's shock home qualifying final loss to the NZ Warriors.

And he is determined to make amends at Suncorp Stadium in his last club match in the Queensland capital before joining the Broncos next season on a lucrative four-year deal.

"My job is to focus on this year and worry about going to Brisbane next year," Folau said on Tuesday.

"... I'm going up there to play for Melbourne and not for Brisbane.

"I'm going up there to do the best I can for Melbourne."

Folau said he had not had much contact with the Broncos since signing a four-year deal with them in April, preferring to leave most of the arrangements to his manager.

Storm coach Craig Bellamy is also confident that the Queensland and Kangaroos star will be totally focused on the job at hand on Saturday night, with the semi-final winners advancing to a preliminary final against Cronulla and the losers eliminated.

"Izzy's with us for this year and when we finish he becomes a Bronco," Bellamy said.

"But at the moment he's still a Storm player and I'm sure that's his mentality.

"He made the announcement that he was going in the week leading up to the Broncos game in round four.

"If that was his mentality, he wouldn't have played the season like he's played.

"He's a Stormer until we finish."

Folau, 20, was disappointed at having turned in a below-par performance in Sunday's shock 18-15 loss to the Warriors, the first time the minor premiers had been beaten by the eighth-placed team under the current NRL finals system.

Big Warriors winger Manu Vatuvei was a constant threat attacking Folau and the Storm's right-side defence, including a bullocking run and off-load to set up Michael Witt's late game-winner.

"My performance on Sunday was pretty disappointing by my standards," said Folau.

"I have to take a bit of the blame for some of the things that happened in the game.

"I've just got to forget about what happened now because it's all over and there's nothing I can do about it.

"I set myself a few goals this year and one of them was to be consistent all year.

"Sunday wasn't a consistent performance for myself.

"I've just got to get my head up and perform well for the team."

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