Janssen's (shoulder) MRI revealed soreness and he will need rest, James Wagner of The Washington Post reports. The Nationals may have to begin the season without Janssen in their bullpen, leaving spots for both Aaron Barrett and Blake Treinen in the early weeks of the season. Janssen's injury also provides more leash for closer Drew Storen, as the Nats' top potential replacement for the ninth-inning role will be unavailable.