Because of my whippy bowling action i have had quite a few shoulder issues, my left one in particular. I found with sprains they just take time to heal - taking pain killers, applying deap heat and maybe some anti-inflamatries will get you through the match but just delay the natural healing process. If you're playing once a week and training just once you will get enough time to recouperate. Injuries are of course subjective, and what one player calls a niggle, others will claim several weeks or months out for......it sound silly but mentally telling yourself it's not that bad has often helped me forget about it and just get on with bowling. If it's really bad after the match tomorrow don't train during the week and just rest it, unless of course you are playing a high standard and if this is the case i would suggest a one-off visit to a sports physio - they can give you some very useful advice and routines to aid the recovery.
This is just my opinion, and i am not saying this is gospel, but just my experience......as im sure more dedicated cricketers will tell me this attitude is wrong and will make things worse!