MLB's transaction log separately lists the injured-list move, while the league's injury update identifies the blister as the reason and confirms the season-ending status. That distinction matters because the Giants can plan around a fixed absence rather than waiting on a short-term day-to-day update.
San Francisco is scheduled to play the Dodgers again Saturday night in Los Angeles. Webb's removal means the Giants' pitching depth will be tested immediately in a division series that already carries a heavy late-season schedule.
The Giants will now have to cover the remaining starts with the rest of their rotation and available call-ups. Webb's season is finished, and the club's postseason path will continue without its established starter.