Charles (undisclosed) was placed on injured reserve by the Seahawks on Sunday with a designation to return, John Boyle of the team's official website reports.
Charles was traded to Seattle in late May, and he suffered an undisclosed injury at some point during the preseason. The wide receiver will now be sidelined for at least four contests to open the regular season, and the earliest he'd be able to return to action is Week 5 against the 49ers on Oct. 11.