Harvin has been recovering from hip surgery since the offseason. He returned to action in a limited role before the team's Week 12 bye week, but there were some complications to his injury. Even if he does play on Monday night, he won't play much.
Fantasy spin: Harvin isn't a reliable fantasy football option yet and may not be for another few weeks. The Seahawks are clearly being cautious with the star wide receiver, who has an injury history. If he manages to get back on the field before the fantasy football playoffs, he could be a savior for some teams. Just don't count on him to get your fantasy team to the playoffs.
As for the rest of the Seahawks' offense, they should be just fine. Expect business as usual.