A day before the Broncos get ready to begin training camp, a key member of its offensive attack is reportedly already on the shelf.According to ProFootballTalk, Broncos running back Devontae Booker has a wrist injury and is expected to miss up to 6-8 weeks, putting the start of the regular season in jeopardy. It’s unclear how Booker was injured, but the second-year back is expected to be placed on the Physically Unable to Perform cheap jerseys list. Behind C.J. Anderson on the depth chart last season, Booker rushed for 612 yards and added 265 receiving yards, scoring five total touchdowns. With Booker injured, expect to see former Chiefs Pro Bowler cheap Jamaal Charles jersey work his way into the Broncos’ running back rotation along with De’Angelo Henderson.