Already highly likely to be without safety Ryan Clark for Monday night's game against Denver, the Steelers will also be missing two more starters on the defensive side of the ball.

Inside linebacker Lawrence Timmons and defensive end Travis Kirschke missed practice for the third consecutive day today and each said after the final tune up before Monday's game that they will not play against the Broncos.

"I am not going to be able to play," said Timmons, who is nursing an ankle injury he suffered two weeks ago against Minnesota.

Kirschke, who already is filling in for the injured Aaron Smith at left end, has a torn left calf muscle that hasn't responded well enough over the past two weeks for him to give it a go Monday.

Our backups are going to need to bring their a game. What esle can go wrong ?