(Renton, WA)  --  Seattle Seahawks head coach Pete Carroll says center Max Unger will be out for three to four weeks as he recovers from a high ankle sprain and twisted knee.  Unger sustained the injuries in Sunday's loss in Kansas City.  Carroll says it's possible Unger will miss the remainder of the Seahawks' regular-season games.  The coach indicates he's looking at perhaps acquiring another player to add depth to the position.