Blackburn (wrist) has a deep bone bruise and will likely be shut down for the season, Joe Stiglich of NBC Sports Bay Area reports.
The severity of the bruise will require Blackburn to be in a splint for a week. That time combined with the necessity of bullpen sessions and potentially a rehab assignment means that a return is extremely unlikely with just a month to go. The Athletics have no reason to rush him back, so consider Blackburn's season over.