Charles (knee) was estimated as a full practice participant on Monday's injury report, John Boyle of the Seahawks' official site reports.
Charles' 21-day practice window opened this past Wednesday, but he was not activated from injured reserve before the Seahawks' 32-29 loss to the 49ers on Sunday. He could be removed from IR ahead of Thursday's game against the Broncos, but Charles would have to log a full session during a normal practice to have a realistic chance of playing against Denver.