Ousted One Nation senator Malcolm Roberts will run for the party in the seat of Ipswich at the upcoming Queensland state election, after the High Court found he was ineligible to sit in Federal Parliament.

The High Court had already ruled Mr Roberts was a dual UK citizen when he nominated for Parliament and it has now ruled him ineligible.

At a press conference, Senator Pauline Hanson made the announcement that she had endorsed Mr Roberts, a decision she said was made after a brief discussion.

"Federal Parliament may have lost Malcolm Roberts, but Queensland has not lost Malcolm Roberts," she said.

"Malcolm will be standing for the seat of Ipswich in the upcoming state election."

The state election is due to be held in January next year, but there is speculation it may be called within days.

Senator Hanson said One Nation state leader Steve Dickson was "over the moon".

"He's so delighted about having an experienced candidate like Malcolm Roberts," he said.

"This is the heart of One Nation, Ipswich is where I ran my fish and chip shop, it's where my politics started, it's where I won the [federal] seat of Oxley in 1996 with the biggest swing in the nation.

"I believe the people of Ipswich will be embracing Malcolm Roberts as their candidate and hopefully electing him to the State Parliament."

Mr Roberts thanked Senator Hanson for her support during the High Court case.

"This magnificent woman - you have not flinched, Pauline, not flinched the whole time, you're like a rock," he said.

"I'd also like to thank my wife Christine and our kids for their support."

The seat of Ipswich is currently held by Labor's Jennifer Howard, with a healthy margin of 16.1 per cent.

Ms Howard said Mr Roberts did not even live in Ipswich.

"The people of Ipswich know a blow-in when they see one," she said.

A Labor stronghold, it has only been held by the LNP for one term in the last 34 years.

Senator Hanson herself came close to winning the nearby seat of Lockyer for One Nation in 2015.

One Nation's original Ipswich candidate Troy Aggett quit earlier this month, vowing to run as an independent instead.