"Something happened in the air in the last quarter of practice when we were working on our 7-on-7s and our passing game," Sherman said in a Friday press conference.
WR Robert Ferguson was also added to the injury report with a hamstring injury. He is listed as probable.
Here's the complete Packers-Colts Friday injury report:
Green Bay: NT Grady Jackson (knee), out; NT James Lee (knee), out; CB Ahmad Carroll (groin), questionable; RB Najeh Davenport(hamstring), questionable; DT Kenny Peterson (ankle), questionable. WR Robert Ferguson (hamstring), probable; CB Micahel Hawthorne (ankle), probable; FB Nick Luchey (groin), probable; CB Mike McKenzie (hamstring), probable.
Indianapolis: CB Joseph Jefferson (knee), out; FS Bob Sanders (foot), out; WR Troy Walters (arm), out. CB Jason David (hip), questionable; RB Edgerrin James (hamstring), questionable; SS Mike Doss (hamstring), questionable. TE Dallas Clark (thigh), probable; LB Gilbert GArdner (ankle), probable; RB James Mungro (wrist), probable; CB Donald STrickland (shoulder), probable.