Sir James Cleverly is expected to return to the Conservative front bench as Kemi Badenoch makes changes to her senior team.
The Leader of the Opposition is expected to reshuffle her shadow cabinet on Tuesday.
A Conservative source said the changes reflect "the next stage of the party's policy renewal programme and underline the unity of the party under new leadership".
The source added that "Sir James Cleverly is expected to return in a prominent frontbench role to take the fight to this dreadful Labour Government".
Sir James served as both foreign secretary and home secretary when the Conservatives were in power.
He stood as a candidate in last year's Conservative leadership election, but lost out on the Tory top job ahead of the final heat between Badenoch and her now-shadow justice secretary Robert Jenrick.
Since the leadership contest, Sir James has returned to the Tory back benches as the MP for Braintree. He has used his influential position as a former minister to warn against pursuing populist agenda akin to Nigel Farage's Reform UK.
Appearing at the Institute For Public Policy Research (IPPR) think tank last week, the senior Tory hit out at calls to "smash the system" and "start again from scratch", branding them "complete nonsense".
He also appeared to take a different position on net zero from party leader Badenoch in a recent speech, urging the Conservatives to reject climate change "luddites" on the right who believe "the way things are now is just fine".
A list of full changes to the Conservative front bench team is set to be announced on Tuesday afternoon.
(PA/London) Note: This article has been edited with the help of Artificial Intelligence.
