Any delay in making a decision in games greatly reduces the efficiency of football players during competitive activities. The aim of this research was to examine the impact of instructions on defensive efficiency. Defensive efficiency was assessed based on the achieved reaction time of the participants in quasi-specific football situations in one-on-one games, using video-based methods. The sample consisted of 20 males, divided into two equal groups: top football players and students. The results of the study have shown that top footballers have a more efficient defensive strategy compared to students, with significant differences observed when presented with stimuli without a fake move (F = 7,190, p = 0.015). The differences were not significant after the response to the stimuli with a fake move (F = 0.348, p = 0.563), but it should be noted that in three out of four cases, the players had a slightly shorter average reaction time. Still, the results have shown that experimental instructions had no effect on defensive efficiency when presenting simple stimuli (F = 2.281, p = 0.148), as well as when presenting more complex stimuli with a fake move (F = 1.170, p = 0.294). Instructions have an important place in young players' training, but defensive efficiency of top players is affected by how well-trained they are, which is manifested through the adopted mechanisms as a result of training. Therefore, it can be concluded that giving instructions must be a part of the individual approach depending on the skill level of the person whom it is communicated to.
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