It wasn't clear on replays whether it was intentional. A league source has confirmed to ESPN's Ed Werder that that NFL will review the contact next week.
Suh was on his chest, taken down by an offensive lineman, when he extended his left foot below Schaub's belt.
"I really don't have anything to say about that play or that person," Schaub said.
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 didn't stick around talk to reporters after Thursday's game, won by Houston 34-31 in overtime.
Information from The Associated Press was used in this report.