The MP for Braintree Brooks Newmark has been appointed the Parliamentary Secretary in the Cabinet Office.
The Essex MP was a government whip from 2010-12 and had been serving on the Treasury Select Committee.
Andrew Lansley leaves the top table of politics after a decade by leaving the Cabinet and announcing he will step down as an MP next year.
David Cameron has carried out the biggest wholesale shake-up of his ministerial team since becoming Prime Minister.
Liz Truss is one of the fastest-rising stars of the 2010 intake of Conservative MPs, reaching the Cabinet at the age of just 38.