The Vikings' quarterback situation, combined with Simpson's lack of production already this season, simply doesn't add up to a roster-caliber player in any league size or format of fantasy football.
However, Harvin's ankle injury does bring some added attention to Simpson in the coming weeks.
More than likely, the Vikings will be without Harvin in Week 10—putting Simpson into the spotlight of a starting position.
However, that doesn't mean Simpson is going to gobble up the targets that were once going to Harvin.
Primarily a downfield, vertical option for the Vikings offense, Simpson has been mostly ignored as quarterback Christian Ponder continues to struggle.
Ponder has twice thrown for less than 100 yards twice in three games, mostly drying up the fantasy value of any Vikings receiver besides Harvin. Hurting Simpson is Ponder's unwillingness to throw downfield, and he's averaged less than three yards per attempt in two of the last three games too.
The results for Simpson have been predictable over that stretch.
Over his last three games, Simpson has caught just four passes on 10 targets for 58 yards. He also lost a fumble during that stretch, which means his fantasy point-production has been pretty much void.
Harvin's targets will go to other receivers in Week 10 if the No. 1 receiver can't go, but don't expect them all to go to Simpson. He'll continue to be a fantasy afterthought in an offense struggling to get anything figured out passing the football. There are simply better waiver wire options than Simpson in Week 10 and down the road.