Abstract: Background and Aim: Research consistently demonstrates that ankle and knee injuries are the most common injury suffered in the athletic population. Ankle injuries are among the main prevailing injuries that occur in football game players. The aim of this study was to investigate the Influence of fatigue protocol on dynamic postural-control task in soccer players with functional ankle instability. Methods: In these study twenty-nine soccer players who were selected by convenience sampling method and were randomly divided into two experimental groups (n=13) and control groups (n=16) with (age: 22.3±2.1 years and height: 176.5±4.4 cm) volunteered as subjects. Semi dynamic by Biodex balance system (BBS) and dynamic balance by Star Excursion Balance test (SEBT) were taken before and after semi-soccer fatigue protocol. For comparison of means groups Repeated measures (GLM-ANOVA) were used and the results were determined within the significance level of (P≤0.05). Results: After fatigue program, semi-dynamic balance on the positions of overall, anterior-posterior and Medial-lateral in both groups reduced significantly (P<0.05). Moreover, the variations of between groups were significant on the all directions of semi-dynamic balance (P<0.05). Also, After fatigue, The Dynamic balance score on the all directions of star Excursion Balance test in both groups reduced significantly (p<0.001). The variations of between groups were significant on the all directions of dynamic balance (P<0.05). Conclusions: At the end of soccer game, the fatigue can significantly reduce semi dynamic and dynamic balance, especially in players with functional ankle instability and probably enhances risk of injury.

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