Three senior Queensland senators could be forced out of their seats by the next election, with momentum building for generational change that would shake up the Sunshine State's Senate ticket.

Attorney-General George Brandis, veteran Ian Macdonald and relative newcomer Barry O'Sullivan's positions are all in doubt as members of the party agitate for "new blood" in a bid to broaden Queensland's talent pool and increase its numbers in future cabinets.

Senators Barry O'Sullivan and Ian Macdonald. Credit:Alex Ellinghausen

Fairfax Media has spoken to nearly a dozen Queensland MPs, party operatives and LNP members and while all three senators dismiss suggestions their future is under a cloud, planning has begun for what would be a seismic shift designed to inject new talent and grow the LNP's influence in the federal Coalition.

"Queensland won the election for Malcolm Turnbull, for the Coalition and there needs to be more acknowledgement of that," a party source said.