Waddle left Wednesday's practice early due to "some muscle tightness," Parker Gabriel of The Denver Post reports.
Broncos coach Sean Payton said he expects Waddle to be fine. The wideout walked off the practice field earlier Wednesday, going back to the locker room without the assistance of a trainer. Waddle has often been banged up throughout this NFL career, but he's never missed time with a hamstring or groin injury -- the most common area of concern for muscular injuries with WRs.