The state opposition has claimed the $5.4 billion Cross River Rail project is up to eight months behind schedule in awarding a key contract.

But the Queensland government insisted there was absolutely no delay in the project.

Cross River Rail's major contracts will be locked in by mid-2019.

A commercial-in-confidence market sounding materials report from August 2017, seen by Brisbane Times, says the Rail, Integration and Systems contract was due to be awarded in October 2018.

However, Cross River Rail chief executive Graeme Newton last week told the Australian Financial Review the project's three major contracts would be awarded in the first half of 2019.