The left cleat of Detroit Lions defensive tackle Ndamukong Suh connected with Houston Texans quarterback Matt Schaub in his groin area in their Thanksgiving game.
It wasn't clear on replays Thursday whether it was intentional.
Suh was on his chest, taken down by an offensive lineman, when he extended his left foot below Schaub's belt.
Last year on Thanksgiving, Suh was ejected for stomping on the right arm of Green Bay offensive lineman Evan Dietrich-Smith and was suspended for two games.
Suh has been fined in previous seasons for roughing up quarterbacks: Cincinnati's Andy Dalton, Chicago's Jay Cutler and Cleveland's Jake Delhomme.
Online: http://pro32.ap.org/poll and http://twitter.com/AP-NFL