Wyatt Roy in trouble in Longman

Assistant minister Wyatt Roy is in trouble in his Queensland seat of Longman.

"It is going to come down to a handful of votes," he told the Nine Network on Saturday.

He said Pauline Hanson's One Nation Party had cut into his primary vote, and where those preferences go would probably determine the outcome.

"It is going to be a bit of a washing machine in those preferences and we don't know where that is going to go," he said.

There were also a high number of pre-poll and postal votes in the southeast Queensland electorate.

He said Longman had a history of being quite volatile and producing unexpected results, but he remained hopeful.