Over the last decades, teachers have often been identified as 'key' players for the improvement of education systems. The successive waves of reform taking place in Latin America since the 1990s have aimed at initial and continuous teacher training. The main changes intended to improve the quality and lengthen the duration of initial teacher training; additionally, the variety of teacher training courses was widened and diversified. This work focuses on the teacher training curricula currently in force for the MERCOSUR member states (Argentina, Brazil, Paraguay and Uruguay). Special attention will be paid to the definitions of the profile that is intended for future teachers, as it is believed that this dimension makes it possible to reveal the different types of expected performance, which will allow us to move towards the dimension of the educational practices. The results obtained from the comparative analysis indicate that the abilities/competences put forth by the four countries are relevant and complementary with each other. Studies of this kind are a step forward in the definition of common policies for MERCOSUR countries aimed at strengthening and articulating teacher training and, specifically, at recognizing teacher qualifications and favouring mobility among countries.