According to Chip Scoggins of Access VIkings for the Minnesota Vikings, Percy Harvin's injury is not the only wide receiver that they should be concerned about...

Scoggins reported via Twitter:

Sidney Rice said it's "up in the air" if he will be ready for the season opener

The Vikings are said to be kicking the tires on Javon Walkeer and Brandon Jones to find backups and depth.  With the Vikings having issues at WR, Packers with their RBs, and the Lions... well... it's the Lions... The Bears-- barring injury-- can be in a position to surprise the NFC North division early on.

Here's the story on Rice: http://www.nationalfootballpost.com/Vikings-work-out-Javon-Walker-Brandon-Jones.html