Even though the relationship is presented by the authors as completely linear, it appears from the separate figures per number of training sessions that the risk of injury, particularly in muscle injuries, only diminishes after four complete group training sessions. Consider also that these football players have on average five training sessions between two games. When transferring these results to lower levels of play, it is the question whether this means that after rehabilitation participating in all training sessions between two games is the minimum requirement, or that only four completed training sessions are needed.
The assumption seems justified, that the level and intensity of the rehabilitation in these professional football clubs is high before the player is declared competition ready (return to play decision). If this process has been less due to facilities, motivation, available time and attention for optimal rehabilitation, it is likely that more training sessions are needed. On the other hand, training without complaints can create a selection bias; this study does not show how many football players sustained a reinjury during the training sessions prior to the first match. Lastly, the average duration of the first game load is less than an hour. This indicates that the reduction in load capacity has been and should be considered.