Both recreational and competitive sports are experiencing growing developments. The traumas related to their practice remain unknown, thus causing a loss of abilities or a definitive stop. It is in this context that the objective of this work is to study the interest of a reathletization program following an anterior cruciate ligament reconstruction of the knee in a young footballer from Dakar Sacré Cœur. We first measured the footballer’s thigh circumference. Then we made him undergo Vameval, Crossover hop and Counter movement jump tests to determine respectively his aerobic endurance, the symmetry of the lower limb and his vertical relaxation. Finally, at the end of the seven (7) week reathletization program at the rate of five (5) sessions per week, we re-evaluated the same variables in the footballer. Thus, the comparison of the values ​​recorded before and after the reathletization program revealed an increase in the thigh perimeter of 3 centimeter, the Maximum Aerobic Speed ​​of 1.18 kilometer per hour, oxygen consumption of 4.13 milliliter per kilogram per minute, the percentage of asymmetry of 3.3 percent in the crossover hop test and the vertical jump of 6.74 centimeter in the Counter movement jump test. It emerges from our case study that an adequate reathletization program after anterior cruciate ligament reconstruction of the knee allowed our young footballer to recover his thigh perimeter, to rebalance the strength of both limbs, to improve his vertical jump and his maximum aerobic speed.