The Denver Broncos will open training camp this Friday, ready to begin preparations for the preseason and eventually set their 53-man roster. Last season, the Broncos kept three quarterbacks on the final roster, and this year, the team should keep four running backs. Last season, the Broncos cut fullback Michael Burton, but re-signed him to the practice squad after he cleared waivers and then called him back up to the main roster, where he played in all 17 regular-season games. The team also had Nate Adkins, who is still on the roster.