Head coach Mike Tomlin feels confident that Troy Polamalu will return to action this Sunday for the first time since suffering a knee injury in Week 1.

That’s the good news. The bad news is that defensive end Aaron Smith has been placed on injured reserve due to a shoulder injury and his season is now over. Look for Travis Kirschke to take over Smith’s defensive end spot, although first round pick Ziggy Hood will get snaps there as well.

This is the type of injury that tests a team’s ability to find depth in the offseason and given that Pittsburgh always drafts well, they should be fine. But Smith’s injury is a major blow to the Steelers’ vaunted run defense, one that has stifled opponents over the years. Kirschke and Hood (and maybe even Nick Eason) need to step up and fill the void or the Smith’s end position will become a weakness opponents can take advantage of.

That said, getting Polamalu back is massive. The Steelers are great without Polamalu, but with him they are exceptional because he freelances so well. Quarterbacks have to know where he is at all times and even then, he still finds a way to make plays.

After sitting out the past four weeks, Polamalu should be hyped up to play on Sunday against Cleveland.