From Marc Topkin:
There's no word yet on how serious then injury is or how it occurred, but at least it's not another injury to Pena's hand (especially considering that Kevin Youkilis is now out for the entire year with a hand injury). In Pena's stead, Dan Johnson should see the majority of playing time at first base, although I wouldn't be surprised if Sean Rodriguez or Ben Zobrist cameoed there against left-handed pitchers.
A few days after placing Andy Sonnanstine on the DL and going with a six-man bullpen, the Rays have decided to call up Dale Thayer to provide some more bullpen depth. For more on Thayer, see FreeZo's notes on him in the article below.