Broncos safety Rahim Moore is expected to miss several weeks with a serious lower leg injury, according to NFL sources.

Moore left Sunday night's game against the Chiefs about halfway through the second quarter, although it remains unclear when he sustained the injury. Before exiting the game, Moore logged two solo tackles and defended a pass. Mike Adams, who started at safety for much of the 2012 season, entered the game in Moore's place and likely will assume the bulk of his role in his absence.

After making a name for himself by blowing coverage on the play that ushered the Broncos out of the playoffs last season, Moore has been having a resurgence in 2013. He started each of the Broncos' first 10 games and has 44 tackles.

A third-year player from UCLA, Moore was on pace to come close to matching his season totals from 2012, when he emerged as a full-time starter for the Broncos.