Rivera or Wilits Relivant

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Mike Scioscia put a positive spin on a potentially disturbing development for the Angels, who sent right fielder Vladimir Guerrero and setup man Scot Shields to Southern California on Wednesday to be examined by Dr. Lewis Yocum. Neither played in the three-game sweep of the Mariners, Guerrero suffering from a sore right knee, which he hurt sliding into third base Sunday, and Shields sidelined by a left rib-cage injury. Both are expected to undergo MRI tests. -- LA Times

Just wondering, if Vlad goes on the DL does anyone think that Rivera or WIllits become fantasy relevant.
Which one would you think would get a majority of the starts. Rivera has decent power, while Willits is a pretty good stolen base and run producing threat.