The parliament speaker is expected to announce when the assembly will begin debating the vote later on Tuesday.
Mariano Rajoy, a prominent target of the antiestablishment fervor rising across Europe, was assured of re-election as prime minister when his Socialist rivals conceded defeat Sunday, ending Spain's 10-month leadership impasse.
Speaking Monday, Rajoy welcomed the Socialists' decision and said that "if the political will is there, we could have a great future ahead for Spain".
With a third ballot on the cards the centre-left Socialists, traditional opponents of the PP, ceded ground on Sunday in an extraordinary, internal party meeting to choose between a third general election or allowing Rajoy to govern.
The conservative Popular party (PP) of the acting prime minister, Rajoy, won elections in December 2015 and again in June this year but without enough seats to rule alone. They have said that they will vote against Rajoy in a first vote on Thursday but then they will abstain in the second and final vote, which is due on Saturday.
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The 61-year-old will likely succeed this time after the Socialists voted Sunday to abstain in such a vote - giving him enough traction to get through. Barring a major upset, Rajoy will be elected premier within a week. The party, long one of the country's major political groups, suffered its worst-ever results in both the December and June elections.
The Socialist party remained bitterly divided on the issue.
They have seen increasingly poor election results and may lose even more seats to Rajoy or the more left-wing Podemos party.
The Socialists, who have 84 deputies, voted for the abstention to avoid a potentially disastrous third election and more political uncertainty. Some regional leaders are threatening to rebel and vote against Mr Rajoy, although this is unlikely to change the ultimate outcome.