Clive Palmer's United Australia Party is set to gain its first sitting MPs with two Liberal National Party defectors planning to announce their membership.

Gaven MP Alex Douglas and Yeerongpilly MP Carl Judge are expected to outline their intentions in Queensland Parliament on Tuesday with both believed to be joining the UAP.

Dr Douglas refused to confirm or deny the move on Tuesday morning saying it was important he follow the process to the letter.

"It's going to be a significant statement this morning and it will be significant for the UAP," he said.