During football games neuromuscular fatigue occuring following eccentric movements such as sprint, jump and run that occur during games. To avoid injury, overtraining and performance decreases, it is important to know when players are recovered. The aim of the pilotstudy was to investigate physiological changes that occur during football matches and if they affect the recovery pattern after several games in professional football players. The method was divided into two sub-studies in which 12 professional footballers, in substudy 1 performed counter movement jump (CMJ) and drop jump (DJ) from 40 cm and fill out a recovery form for muscle soreness 36 hours before, 12-16 and 60-64 hours after 11 different competetive games. Blood samples were taken on the players in connection with one match to examine the activity of muscle enzyme creatine kinase (CK) and lactate dehydrogenase (LDH) of the players. In study 2 received nine professional players carry the same explosive jump that in sub-study 1 but then one hour before, 30 minutes and 50 hours for 3 different friendly games. The results were very varying. The main findings were that the trends in perceived muscle soreness after all matches were raised. Muscle enzymes CK and LDH were both elevated 16 hours after the match and was not back at baseline after 64 hours. The contact time in the jumping mat was higher than baseline in all three matches in the sub-study 2, 30 minutes after the match and it was not back to baseline in two of the matches after 50 hours. Conclusion: The results show trends that the recovery may vary in different matches. The results in the increased trend in muscle soreness and increased enzyme activity in the blood indicate that the players are not recovered 64 hours after the match. The increased contact time in hopes carpet in substudy 2 indicate that the function of the stretch-shortening cycle of the lower extremity are not recovered 50 hours after the match. Further studies are required to draw any major conclusions.