Seem to be a lot of injuries in cricket now, especially fast bowlers, Notts signed Paul Coughlin at the end of the summer in 2017. He immediately got injured playing for the England Lions (sort of England second eleven), In the West Indies if I remember correctly. He couldn't bowl all season (which is his strong point), but attempted unsuccessfully to play a couple of T20 games for us as a batsman.
We also lost Nash for half the season (bad injury diving to take a catch), and then Jake Ball started to suffer from fast bowling injuries which took him out from a lot of games at the end of the season, and helped him lose his England contract.
Hopefully they all get fit, and we have more luck next season !