Shamar Stephen had surgery on his knee, per Zimmer. Expects him to be back by Week 1

— Andrew Krammer (@Andrew_Krammer) August 19, 2015

With Shamar Stephen ailing, Mike Zimmer said it's very possible he can have a three-man rotation at DT. Says Crichton also can go inside.

— Chris Tomasson (@christomasson) August 19, 2015

Carter Bykowski had surgery, too. Hurt his shoulder last Saturday.

— Matt Vensel (@mattvensel) August 19, 2015

Mike Zimmer said he doesn't know how long Carter Bykowski will be out following shoulder surgery. Doesn't know if season-ending injury.

— Chris Tomasson (@christomasson) August 19, 2015

Antone Exum has a hamstring injury, Mike Zimmer said. John Sullivan missed practice with spasms.

— Ben Goessling (@GoesslingStrib) August 19, 2015

MyCole Pruitt is out of his walking boot, so that's a positive sign.

— Matt Vensel (@mattvensel) August 19, 2015