"He's in the exercise mode right now. He won't be back out there until he's completely well," coach John Fox told KOA-AM radio Wednesday morning, via Broncos public relations vice president Patrick Smyth.
Players aren't allowed to be in "exercise mode" until symptoms have begun to subside, so that is a positive step. The veteran receiver still needs to clear concussion protocol before he can play in the Week 1 opener against the Indianapolis Colts.
On Tuesday, Fox told NFL Media Insider Ian Rapoport that Welker was doing "fantastic" and there is a lot of optimism.