When Jenks was originally signed, he was seen as a buy-low candidate, coming over on a two-year, $12 million contract after a season of big peripherals and bad results with the White Sox. In Boston, however, he never found his old form struggling with control and injury. By the end of the season, his medical issues became serious, and over the offseason complications from a surgery for bone spurs left Jenks' life at risk.
Any hope Jenks had to make a comeback with the Sox in 2012 came to an end in spring training, when he was charged with a DUI and (property) hit-and-run down in Florida.
Since Jenks was on the 60-day DL, the move will have no effect on the Red Sox' 40-man roster, which is becoming increasingly crowded these days.