Sir Graham Brady will return as chairman of the 1922 Committee of backbench Tory MPs after quitting the role while mulling a Conservative leadership bid.
His return was announced on Tuesday before a parliamentary showdown between Boris Johnson and MPs attempting to prevent a no-deal Brexit.
In May, the Tory MP stood down from the position which gave him a significant role in Theresa May's departure as prime minister as he considered his own chances of leading the party.
A statement from the committee said he would return as chairman "until a new executive is elected in the next session of Parliament".
The MP for Altrincham and Sale West had chaired the committee for nearly a decade and held shadow cabinet positions under David Cameron while in opposition.
Sir Graham has said the only way to regain the public's trust is to leave the EU by the current Halloween deadline.