28 February 2014 Gozi joined the Renzi Cabinet as Under-Secretary for European Affairs in the office of Prime Minister Matteo Renzi. Despite not receiving the title of Minister, as his predecessors, Gozi was tasked with coordinating, with the Minister of Foreign Affairs, the six months of Italy's Presidency of the EU Council. In 2014 and 2015 he also signed up as member of the Italian Radicals. In 2014, Gozi and the French Secretary of State for European Affairs Harlem Désir set out a list of priorities after talks in Paris, saying the European Commission should adopt more growth-friendly economic policies and grant maximum flexibility within existing EU budget rules to countries undertaking growth-promoting investments and structural economic reforms. In 2015, Gozi called for a two-speed Europe that would let countries which desired closer integration forge ahead. A year later, he said Italy also wanted a single economy minister for the eurozone answerable to elected governments. At the 2018 elections Gozi was candidate for parliament in his native Emilia-Romagna, where he came in third among the PD candidates and was not elected. In November 2018 in Vienna he was elected president of the Union of European Federalists. In December 2018 Gozi claimed to be working, together with Carlo Calenda and +Europa, on a new party for Matteo Renzi aimed at gathering the votes of "moderates" leaving Forza Italia and of disgruntled grillini. On 20 September 2019 he announced his departure towards Italia Viva, Matteo Renzi's new centrist party. In April 2019, together with the Central Bank of San Marino's president Catia Tomasetti, Gozi was investigated by the court of the Republic of San Marino for "unfaithful administration" as part of a "phantom" consultancy for the Central Bank on the "regulatory adjustment to harmonize relations with the EU". On 2 July 2020, Gozi and Tomasetti were fully released from any accusation as it appeared that there was no relevant conduct against them. In 2021, the Judge responsible for the investigation, Alberto Buriani, has been committed for trial for perjury and attempted concussion against President Tomasetti for facts relating to the aforementioned investigation as well as breach of investigation secrecy and of professional secrecy, concerning the investigation of Gozi and Tomasetti. Member of the European Parliament, 2020–present For the 2019 European elections, Gozi joined the election campaign in France on the joint Renaissance list of Emmanuel Macron's La République en Marche (LREM) and