That's fair. How about adding a bit more info in that case, to make it more useful? I suggest:
1) He will return/He will not return
2) mild (he will return)/moderate (he will not return and he will not be green for 1-3 weeks)/serious (he will not return and he will not be green for 4 or more weeks)
3) [the least wordy] "suffered a mild injury" if player will return, nothing (regular message) if he won't