Injuries are an unfortunate part of the game, and training camp is no exception.

On the same day the Chargers waived-injured two undrafted free agents in Carlos Wray and Terrell Chestnut, they saw one of their veteran wide receivers get helped off the field.

After making a sliding grab during 7-on-7's, Stevie Johnson took a couple steps forward before going back to the ground.  After remaining there for a few minutes, he headed into the locker room with the team's training staff.

"We sent him for a test," said Head Coach Mike McCoy. "It's his knee.  I don't have any update from practice.  He went down there when he caught the ball, hit the ground and got up.  Then he felt something in his knee.  So we'll get that checked out, and we'll have more information for you tomorrow."

A nine-year veteran who made his bones in Buffalo where he became the first wideout in Bills history to post three 1,000-yard seasons in a row, Johnson is entering his second season in San Diego.  He battled hamstring and groin injuries last year to play in 10 games with eight starts, finishing fourth on the team with 45 receptions for 497 yards and three touchdowns.