Bosa (knee) didn't participate in drills during the early portion of Monday's practice in Melbourne, Australia that was open to the media, Matt Maiocco of NBC Sports Bay Area reports.
While Bosa making the trip to Australia was considered encouraging in his comeback attempt from last season's ACL injury, he had been working off to the side in recent practices before the Niners left for Australia. He'll likely need to upgrade to full participation in practice by Wednesday to have a realistic chance at suiting up in Thursday's season opener versus the Rams.