ALTHOUGH LNP pre-selection nominations are open for the seat of Whitsunday until Friday, Queensland Premier Campbell Newman has formally endorsed sitting member Jason Costigan for a second term in office.

In a letter dated September 24, the Premier writes of his pleasure to provide an endorsement for the "hardworking" state representative for Whitsunday.

"I have no hesitation in supporting Jason as he seeks the opportunity to represent his community for a second term," Mr Newman's letter said.

"Jason has demonstrated true grit and passion to become the first LNP Member elected to represent the seat of Whitsunday.

"He is an enthusiastic and dedicated local member and a strong advocate for his community."

Mr Newman said he was proud of Mr Costigan's good work with the Whitsunday tourism industry, the tenacity with which he fought to secure sustainable funding upgrades to the Bruce Highway and his contribution to the development of Safe Night Out Precincts in Airlie Beach and Mackay.

Mr Costigan said he was humbled and encouraged by the Premier's kind words and steadfast support.

"The boss clearly wants me to stay on as part of his team, a team that is continuing to work hard to get Queensland back on track after Labor's 20 years of debt and deception," he said.

"Hopefully, any white ants out there will smell the roses and let us get on with that very important work and, in my case, continuing to work hard for the good people of Whitsunday."

Mr Costigan won the seat of Whitsunday in 2012 in an electoral landslide.

The premier's endorsement comes after months of speculation that a challenge for the seat of Whitsunday was likely.

The LNP's pre-selection nominations for the seat of Whitsunday close at 3pm on Friday.

Labor's Bronwyn Taha has confirmed she will contest the seat.

Ms Taha previously worked for Labor member for Whitsunday Jan Jarratt who was defeated by Mr Costigan at the last state election.