"This article reconstructs the role of European Commission President's political entrepreneurship in the further socialisation of the European Semester. Firstly, it analyses the context in which Juncker promoted the European Pillar of Social Rights. Secondly, it presents how such an initiative was mainstreamed into the Semester. Finally, by distinguishing among social retrenchment, social investment and social protection prescriptions, it analyses whether the post-2015 development of the Semester was consistent with Juncker's political efort. We fnd clear evidence of entrepreneurial activities in the strategic recourse to Presidency's Cabinet and the Secretary General and in the introduction of a new Social Scoreboard. Furthermore, we show that such socialisation process is congruent to the expected impact of European Pillar of Social Rights, which indeed contributes to strengthen an already ongoing incremental trend. Our analysis contributes to better qualify the socialisation process by highlighting its characteristics and the role of politics. These fndings are particularly important to understand whether the Social Pillar left a legacy to the current Commission's social agenda and to the EU responses to the Covid-19 pandemic, and whether these changes open a new window of opportunity to further reform the Semester"

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