Penny suffered a hamstring injury in Sunday's 23-13 loss to the Cardinals, per coach Pete Carroll, Bob Condotta of The Seattle Times reports.
Penny rushed twice for 19 yards and wasn't targeted in the passing game prior to getting hurt. The 2018 first-round pick has an opportunity to carve out a larger role with Chris Carson (neck) out for the season, but injuries have kept Penny from cutting into Alex Collins' newly found lead role in Seattle's backfield.