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Imagery is a cognitive process that can play an important role in planning and execution of movements or actions. Several instruments have been developed in order to evaluate the ability of Imagery in sport. However, none focused on the kinesthetic, visual internal and visual external modalities. The objective of this study was to translate and validate preliminary for the Portuguese sports population the Movement Imagery Questionnaire-3, determining its initial psychometric qualities through an exploratory factor analysis model that supports it. The sample comprised 176 subjects (N = 176) (N = 134 male, female N = 42) with a mean age of 20.8 years (SD = 5.94), consisting of soccer (N = 113), basketball (N = 43) and tennis (N = 20) players. Initially it was found that the procedures of translation and adaptation originated a Portuguese version MIQ - 3 similar to the original version. Secondly we found that the psychometric qualities prove their suitability of adaptation performed, demonstrating that its factor structure is the same as the original version (12 items grouped into 3 factors, with 4 items each factor), with quite acceptable levels of validity and reliability (Cronbach's alpha: 0.88 to MIQ - 3, 0.79 for the three modalities), concluding that this questionnaire can be used to assess Imagery capacity in Portuguese athletes. [ABSTRACT FROM AUTHOR]