This article proposes an alternative to more standard, neoclassical theories concerned with the proceduralisation of constituent power. It argues that more established theories of proceduralisation are insufficiently aligned to the sociological realities in which constituent power is located and expressed, and their residual fixation on the premises of classical constitutionalism impedes adequate understanding of constituent power in the global constitutional order of contemporary society. On this basis, the article offers a sociological examination of constituent power, which attempts to grasp constituent power in its objectively existing procedural form. In particular, it claims that constituent power now exists as an inner-legal function, activated through procedures within an increasingly differentiated legal system: whereas in classical theory constituent power was a primary political source of constitutional norms, it now appears only as a secondary expression of norms already contained within the global legal system. Rather than renouncing the idea of constituent power, however, the article uses its sociological focus to observe new procedural openings for the activation of constituent agency, adapted to the material/sociological fabric of contemporary society.