It wasn't clear on replays Thursday whether it was intentional.
"I really don't have anything to say about that play or that person," Schaub said.
Suh was on his chest, taken down by an offensive lineman, when he extended his left foot below Schaub's belt. Suh didn't talk to reporters after the game.
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.