Pittsburgh Steelers rookie Derrick Harmon has avoided a serious injury after his knee bent awkwardly during a preseason game against Carolina.

Pittsburgh Steelers first-round pick Derrick Harmon was carted off the field during Thursday's preseason game against the Carolina Panthers after sustaining a knee sprain. Harmon is expected to be out for about a month, according to NFL Media, which makes him a candidate to begin the season on injured reserve.

Here are the biggest takeaways following the new injury update on Steelers rookie DL Derrick Harmon's knee sprain.