The Denver Broncos thoroughly enjoyed Trevor Siemian 's breakout performance in Week 3 against the Cincinnati Bengals .
Peyton Manning 's replacement left Sunday 's game against the Tampa Bay Buccaneers with a left shoulder injury .
The Denver Broncos thoroughly enjoyed Trevor Siemian 's breakout performance in Week 3 against the Cincinnati Bengals , but Peyton Manning 's replacement left Sunday 's game against the Tampa Bay Buccaneers with a left shoulder injury .