The Queensland Teachers Union (QTU) says it is rumoured the Costello audit report recommends the sale of five primary schools in Brisbane and the Gold Coast built on prime real estate, to help the State Government reduce debt.
The QTU says Brisbane Central, Fortitude Valley, Hamilton, East Brisbane and Broadbeach state schools are under consideration.
Mr Langbroek says he is awaiting the findings of the Costello audit, but no sales will take place in the short-term.
He says a committee is reviewing demand at more than 1,200 state schools.
"No-one has anything to fear for 2013 and the school year that's starting in just under a month," he said.
Mr Langbroek says the QTU is "scare-mongering" with claims state schools will be sold.
"It's not true and it's the Queensland Teachers Union doing unfair things in Queensland communities," he said.
"We'll make sure that we have proper consultation with all of those schools, their communities, the parents and teachers, as well as the principals, to make sure that our planning process is strong and they can every confidence in schools in their area or in schools nearby."
But QTU spokesman Kevin Bates says the short-term promise is not good enough.
"That's cold comfort for parents and students," he said.
"If they Government's looking to return a profit from any sale of any school, then it's going to need to sell those that are on valuable land."
He says Mr Langbroek should rule out selling the schools in the future.
"Parents will have to say to themselves are they going to re-enrol their students at these four inner-city Brisbane schools?" she said.
"Are they going to re-enrol their students at Broadbeach when the axe is hanging over these schools?"