The Seahawks made the announcement on Monday. The team is not scheduled to practice until Tuesday following last Thursday's win over Arizona. Harvin has been on the physically unable to perform list all season after surgery to repair the labrum in his hip in early August.
Seattle now has three weeks to add Harvin to the active roster. He could play as soon as next Monday at St. Louis and the latest Harvin could return would be Week 11 against Minnesota.
Seattle traded a trio of draft picks, including its first round pick in the 2013 draft, to the Vikings in exchange for the speedy Harvin.