The Lions came out of Sunday's game at Seattle with two worrisome injuries on defense: a hamstring injury to linebacker Ernie Sims, and a knee injury to rookie free safety Louis Delmas.

According to head coach Jim Schwartz, Sims' injury "has a chance to be" significant, while Delmas leaving the game with a twisted knee may have been more in the realm of a scare.

"We’ll see on Wednesday, but it’s more into the short-term, bumps-and-bruises type thing," said Schwartz of the rookie's status.

Sims had tests on his injured hamstring Monday morning, then went through meetings with his teammates, before heading to the hospital for more tests Monday afternoon.

"I’ve never had a hamstring injury before, so I’m just hoping that it’s not that bad, so I can get back on the field," Sims said in the locker room, before heading to the hospital.

Delmas missed time in training camp with injuries, but has started every regular-season game so far in his rookie season, one of just two — along with tight end Brandon Pettigrew — of the Lions' prized rookies to do so. Sims, who had started every game in his first three seasons with the Lions, injured his shoulder against Minnesota in Week 2, then was inactive against Washington in Week 3, and limited in effectiveness the next three games. Rookie DeAndre Levy started in Sims' place against Washington, Pittsburgh and Green Bay.