Hammy twinges can be tricky. Easy to damage further if play again too early.
The chances of finishing 2nd are pretty much gone, if they have to rest him until finals they will.
I guess difference between park football where most of us have played, is you have to judge yourself when you your ‘body is right’, and of course can enthusiastically over estimate that timeframe. Pro footballers will have a top sports physio monitoring their recovery every waking hour.