NFC North Thursday practice report

Let's get inside a newsy Thursday practice report:

Detroit Lions: All players participated in at least a portion of practice except defensive tackle Corey Williams (knee). That includes receiver Titus Young (knee), who was limited. Meanwhile, coach Jim Schwartz vehemently denied that receiver Calvin Johnson suffered a concussion but kept playing in Week 4 against the Minnesota Vikings, as Johnson implied in a pair of interviews. "Our evaluation was that he was not concussed," Schwartz said. "He was thoroughly checked. We were very strong in our evaluation."

Green Bay Packers: The Packers had two tight ends sit out practice, Jermichael Finley (shoulder) and D.J. Williams (hamstring). Williams' injury popped up late in Wednesday's practice. We'll see if either can practice Friday and be available for Sunday's game against the Houston Texans. The Packers' two healthy tight ends are Tom Crabtree and Ryan Taylor. Nose tackle B.J. Raji (ankle) and receiver Greg Jennings (groin) also missed practice again.

Minnesota Vikings: Defensive lineman Everson Griffen missed practice because his mother died unexpectedly during a visit to Minnesota on Wednesday, coach Leslie Frazier told reporters. Tailback Adrian Peterson (ankle) and receiver Jerome Simpson (foot/back), and defensive lineman Kevin Williams (illnesss) all returned to practice. Peterson and Simpson were limited, as was receiver Percy Harvin, who is dealing with a hamstring issue.