This study, inserted in the field of teacher education, aimed at researching the marks of the practicum which can be perceived in the constituent elements of different dimensions of the professional identity of future Spanish teachers, based on subjects perceptions. It is assumed that teacher identity is built in a continuous way throughout the entire career of the teacher, being the practicum participant of this process during the initial teacher education program. Also, it is defended the thesis that the practicum can be a fundamental element, in teacher education, for the formation of teacher identity. The research sought to answer the following questions: how can the practicum influence the professional identity construction of future Spanish teachers? Which elements constitute the identity of the subjects regarding the motivational and representational dimensions? Which marks of the practicum can be perceived in different dimensions of their professional identity? For that, the concepts of teacher professional identity and linguistic identity were analyzed, as well as the role of the practicum in initial teacher education. From the methodological point of view, this is a qualitative study and used the questionnaire to characterize the informants, the semi-structured interview, the document analysis and the field diary. Discursive textual analysis was used as method for data analysis. The group of participants that integrates the subjects of the research was composed of Spanish teachers in the final phase of the initial teacher education program, of a public university in the state of Mato Grosso do Sul, who had already completed the Spanish practicums. The categories of data analysis were: motivational dimension, representational dimension and practicum. In addition to these categories, subcategories were defined from the sense units that emerged from the corpus of the research. The results showed that: concerning the motivational dimension, the teacher education program, the practicum and entrance in the labor market are motivating factors of the teaching of Spanish; the practicum participates in a particular and diversified way in the construction of the professional identity of the research participants, being related to their self-perception as teachers, to the image of the Spanish teacher and the image of theirselves as Spanish teachers; the linguistic identity is an element of great influence in the construction of Spanish teacher representation; life histories, primary and secondary socialization and contact with the other are also constitutive elements of the identity of future Spanish teachers; lastly, the research participants perceive the practicum as a moment of encounters, discoveries and transformations, as well as the application of theoretical knowledge, besides criticizing its development in the course. As final research considerations, it was observed that although the practicum participates in the construction of teacher identity, this participation does not occur in all its potentiality and greater attention is needed to its development, especially, with respect to teachers socialization in the profession and the reflection on their practice.