Denver puts tight end on IR

Posted by ESPN.com's Bill Williamson

The Denver Broncos put backup tight end Nate Jackson on the injured reserve list Thursday, the team's 12th player to go on IR this season. He suffered a hamstring injury in practice Wednesday.

Denver brought back tight end Chad Mustard to take Jackson's place. Jackson is a pass-catching specialist. Mustard is more of a blocking tight end.

With Jackson out, Denver needs to hope Tony Scheffler can stay healthy. He has been dealing with a groin injury since Oct. 5. Scheffler played and was productive against Cleveland on Nov. 6 but didn't play much against Atlanta on Sunday.

The Broncos have had to make a lot of moves but not as many as the Chiefs who have been a revolving door this season as they try to find players for the future. The Chiefs have 14 new players since Week 8.