Entrepreneurial teams need to establish and maintain productive working relationships. However, the nature of social relationships can represent a significant source of uncertainty, mainly in early stages of these relationships, and when the interdependence between the persons involved is high. Although, these conditions are particularly true for entrepreneurial teams of newly founded ventures, research on uncertainty stemming from within the entrepreneurial team remains sparse. Drawing on the concept of relational uncertainty, which originates from work in family psychology, we suggest to provide more nuanced insights into the development of entrepreneurial teams.