Winfree did not practice Thursday due to a hamstring injury, Ryan O'Halloran of The Denver Post reports.
Winfree didn't occupy a spot on Wednesday's injury report, so it's somewhat concerning to see him now sidelined due to a hamstring issue. The rookie sixth-round pick hasn't suited up for game action since Week 9, so there wouldn't be any notable fantasy ramifications if he were forced to miss any time.