Pittsburgh Steelers rookie running back Le'Veon Bell aggravated his left knee Thursday according to coach Mike Tomlin.

Bell was hit by a teammate during a non-contact drill. It appeared that Bell thought the play was finished when he was taken down.

Tomlin said Bell will be evaluated later.

Bell didn't take another snap in practice and had his left leg heavily wrapped. He never left the field and took the wrap off when practice ended.