According to Pete Carroll (via Danny O' Neill of the Seattle Times), Martin badly pulled his calf and has been placed on the injured reserved list. The Seahawks are expected to sign receiver Deon Butler to replace Martin.
Butler was drafted by the Seahawks in the third-round of the 2009 draft. He was waived from the team on Aug. 31, 2012 as part of the final roster cuts. For his career he has 57 receptions for 611 yards and four touchdowns, all as a Seahawk.
Martin has only appeared in four games for the Seahawks this year and has totaled four receptions for 42 yards. The Walla Walla native was signed as a free agent at this past offseason. The Seahawks waived Martin but later signed him to the practice squad.