Marion was injured in the first half against the Jets and was replaced by second-year player Arturo Freeman. Coach Dave Wannstedt praised Freeman's work on Monday, but said it wasn't automatic that Freeman would replace Marion in the starting lineup.
Wannstedt said it would go with either Freeman or veteran Shawn Wooden, who has seen action only on special teams this season.
Marion's injury was the only one of note sustained by the Dophins in the loss to the Jets.
Offensive tackle Todd Wade has been making progress since injuring a knee in the victory over New England and should be ready to play against Seattle.