Detroit Lions injury report: Training camp Day 9

After a day off on Tuesday, the Detroit Lions were back on the practice field on Wednesday. Some roster moves were announced beforehand, rooted in tight end Shane Zylstra's significant knee injury suffered during Monday's practice.

But with some injury situations to watch as practice resumed, here's a fresh injury update for the Lions.

Right tackle Penei Sewell landed in concussion protocol after missing last Friday's practice. Wednesday was the earliest day he could return, and he did so.

Tight end Sam LaPorta also left Monday's practice with an unknown issue. Head coach Dan Campbell deemed it an ankle injury that was not regarded as serious, and the rookie's participation level on Wednesday confirmed the lack of severity.

Center Frank Ragnow was not seen on the field Wednesday. But his wife Lucy is expecting a baby any day now, so that's the likely explanation.

Now that he's back in the building, cornerback Emmanuel Moseley was officially placed on the PUP list Wednesday morning as he works his way back from a torn ACL. He can come off the list at any time before final roster cuts, but when that'll be is anyone's guess right now. Dave Birkett of the Detroit Free Press reported he had a second "clean up" procedure on his knee, but Campbell would not address that.

Detroit Lions injury report: A couple potentially significant injuries

Safety Ifeatu Melifonwu was not present at Wednesday's practice, even in street clothes. Dave Birkett of the Detroit Free Press reported he is dealing with a knee injury,

Melifonwu has only played 17 games in his first two seasons. This training camp is critical for him, and now it looks like he may be out awhile.

Toward the end of Wednesday's session, wide receiver Trinity Benson suffered a leg injury and had to be carted off. An update on him, and Melifonwu, may come from Campbell on Thursday morning.