4. Joe Cokanasiga (KNEE)
The Bath speedster suffered a serious knee injury while away with England at the 2019 Rugby World Cup.
To make matters worse the winger continued to train on the damaged knee throughout the course of the tournament in Japan and played with it heavily strapped while scoring two tries against the USA in his only appearance of the tournament.
The result of which was Cokanasiga not only damaged his knee but caused secondary problems to his lower body and back which was overcompensating for the weakened area of his body as the 6ft 3in 18 and half stone back did more than 20km a week of running on his injury.