Updated

Peyton Manning returned to Broncos headquarters Monday, starting voluntary workouts with his group of receivers, which now includes Wes Welker, formerly the top target for Tom Brady and the New England Patriots.

The 37-year-old quarterback was working with his receivers a week ago at Duke, where the quarterback's former college coach, David Cutcliffe, ran a mini-camp of sorts with Manning, his brother, Eli, and an assortment of Broncos and Giants receivers.

After taking two months away from football — about a month more than he'd hoped for — Manning said it's hard to gauge the way his arm feels this time this year compared to last. He conceded he wasn't sure if he'd ever get back to where he was before the neck surgeries that cost him the 2011 season.