Coaches want calls in their favor. They don't care if you are hurt or not. Telling them ahead of time comes off to me as "….i might not do a very good job tonight because i'm hurt….give me a break/sympathy."
...And if mistakes are made you have given the coach reason to take a shot…"You knew you were hurt..why the hell didn't you get a sub."
If you can't do the job don't go. If you can then go and work. Coaches aren't entitled to nor do they want an injury report. That's what I would tell somebody who thought it was a good idea.
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