After the game, coach Mike Holmgren said that they believed Charlton had a sprained knee. Results of an MRI taken Sunday will reveal more about how much time the second-year corner will miss, beyond what looks like the season opener this weekend against the Cleveland Browns.
"To speculate more than that would be unfair, but he might have a little something fixed in there," Holmgren said in a post-game press conference.
Charlton's injury may speed up the return of Shawn Springs, who tore his left hamstring during the first preseason game at Indianapolis.
Willie Williams started in place of Springs the following week but left the game with a fractured left forearm and isn't expected to return until the end of September.
Charlton assumed starting duties at left corner after Williams' injury against the Cardinals, with rookie Ken Lucas starting opposite.
Lucas and Charlton both started against the 49ers and played well, giving up a handful of short passes while guarding against the deep ball.
Now with Charlton's injury and the regular season opener one week away, the Seahawks may be forced to look for help on the waiver wires. With teams forced to trim rosters to 53 players today, they will have a handful of players to choose from for help, in addition to possible trades and free agent signings.
Depending on how much time Charlton misses and who the team finds for help, Springs could possibly return to the lineup for the team's home opener against the Chiefs on Sept. 16.
Charlton injury latest blow to secondary
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