PITTSBURGH (AP) — Derrick Harmon knew his first preseason in the NFL was over the moment the Pittsburgh Steelers rookie defensive tackle felt his right knee bend awkwardly underneath him early in the second quarter against Carolina.

As he was carted off the field Thursday night, the 21st overall pick in the draft feared his regular season might be in danger, too.

Turns out it's not.

After some anxious moments that left the 22-year-old near tears, an MRI revealed that Harmon is dealing with a sprain that coach Mike Tomlin characterized as “week to week.” Tomlin declined to speculate on whether the team will place Harmon on injured reserve , saying the club wasn't having those discussions yet.

That answer would indicate there's a chance Harmon, who played collegiately at Michigan Sta

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