ALLEN PARK -- With seven defensive backs missing from Tuesday’s morning practice, coach Jim Schwartz cut the last period short.

“We’ve got to get some of those corners back out there, our numbers are down there, you’re starting to see that chain reaction stuff. I thought we managed practice well to be able to make it through with those guys,’’ Schwartz said.

Sitting out were S Louis Delmas (groin), CB Jonathan Wade (broken finger), CB Dre Bly (thigh), CB Dante Wesley. CB Aaron Berry, S Ko Simpson (who was taken off the physically unable to perform list on Monday) and CB Jack Williams (the only remaining player on PUP).

Also S Randy Phillips had to leave practice early because of dehydration.

The good news is that most of the injuries are short-term. Some of the players could practice later this afternoon, including Delmas.

“He had a really good day (Monday), a hard work day. Just like all these other guys when he had that hard work day he just got sore afterwards. ... We never want to practice a guy that going into practice he’s already sore. ...He’s been doing well, he moved really well yesterday, he’s got fresh legs, we want to keep it that way,’’ Schwartz said of Delmas.

Delmas did not play in Saturday’s preseason opener. While it’s too early to rule him out for Saturday’s game at Denver, he’s at least extremely questionable.

Also sitting out Tuesday morning was LB DeAndre Levy, who has been slowed down with a back injury. He said he plans to practice this afternoon.

(Follow me on Twitter @paulapasche.)