
The ERC's 13 lawmakers will abstain from voting in a confidence vote in parliament next week, top party official Pere Aragones said following a meeting of its national committee, a move that allows Sanchez to stay on following two inconclusive elections last year.
Sanchez's Socialists won the most seats in a repeat November general election but were weakened, falling far short of an absolute majority in Spain's 350-seat parliament.
The Socialists have struck an agreement to form a coalition government with far-left party Podemos in what would be the first such power-sharing deal since the country returned to democracy following the death of long-time dictator Francisco Franco in 1975.
The two parties together still fall short of a majority with 155 seats in the assembly. Sanchez has already secured the support of several smaller regional parties and had been negotiating with the ERC since the November polls.
The announcement came after ERC and Socialists said in separate statements they had agreed to set up negotiations between Spain's central government and the Catalan government to "unblock the political conflict over the future of Catalonia and establish the basis for its resolution."
"It is a difficult, complex path. We think it is worth taking," Aragones, Catalonia's vice president, told reporters.
Weekend debate
Catalonia has been rocked by sometimes violent protests after Spain's Supreme Court in October sentenced nine Catalan leaders to lengthy jail terms over their role in staging a banned secession referendum in 2017 in the wealthy northeastern region and a subsequent declaration of independence.
The leader of the ERC, former Catalan vice president Oriol Junqueras, was among those sentenced.
Since the failed 2017 independence bid the ERC has adopted a more moderate stance, believing it is the best way to increase support for separatism in the longer term.
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