The appointment ends a week-long political crisis triggered by a `No` vote in a December 4 referendum on constitutional reforms, which led Matteo Renzi, its chief sponsor, to give up prime ministry.
As prime minister designate, Gentiloni is now asked to put together a list of ministers, return to Mattarella for the swearing-in of his government, and win votes of confidence in both houses of parliament.
The process is expected to be completed within days, in time for Thursday`s European Union summit in Brussels, which should mark the new prime minister`s debut on the international scene.
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