Guerrier had an MRI, which revealed no issues with the ligament that leads to Tommy John surgery. He received a platelet-rich plasma injection, will rest for several days, then begin tossing.
The Dodgers called up left-hander Michael Antonini from Triple-A Albuquerque to replace Guerrier in the bullpen.
Guerrier last pitched a week ago and the placement on the disabled list was retroactive to April 18. He said he's been dealing with the condition since Spring Training and it doesn't bother him when he's pitching, but he has trouble getting loose the next day.
"I could pitch through it, but it puts the guys in the bullpen in a tough position when I need a day off after every game I pitch," he said.
Manager Don Mattingly said the decision to put Guerrier on the DL was made after Monday night's game.
"We thought it was normal stuff the first couple days, but when it extended it was like, 'What's going on here?'" Mattingly said. "The biggest problem is he doesn't know how he feels the next day. I could tell last night by his answers that he didn't know what's going on."
Guerrier had a 2.70 ERA in seven games but walked five in 6 2/3 innings. Guerrier signed a three-year, $12 million contract before the 2011 season. This is the first time he's been on the disabled list with an arm injury. The only other time he's been disabled was in 2006 for a fractured thumb.