Kenley Jansen underwent foot surgery Tuesday, and will miss the start of the season:

News of problems with Jansen’s left foot came suddenly, according to the Dodgers. Jansen reported discomfort while running last week, the team said in a written statement.

Jansen subsequently underwent a series of exams, which revealed a growth from the fifth metatarsal in his left foot. The growth was removed Tuesday morning in an operation performed by Drs. Earl Brien and David Thordarson, who worked under the direction of team physician Dr. Neal ElAttrache.

Jansen will be on crutches for 10 days, after which he will be in a boot for three to four weeks.

I’m guessing Joel Peralta will get a shot at closing until Jansen returns.