In addition to his role in parliament, Venizelos has been serving as member of the Greek delegation to the Parliamentary Assembly of the Council of Europe since 2016. A member of the Socialists, Democrats and Greens Group, he serves on the Committee on Legal Affairs and Human Rights; its Sub-Committee on the implementation of judgments of the European Court of Human Rights; the Committee on Rules of Procedure, Immunities and Institutional Affairs; and Committee on the Election of Judges to the European Court of Human Rights.