Guerrier was 2-3 with a 4.80 ERA in 34 appearances with the Dodgers this season. In three seasons with the club, the right-hander was 6-8 with a 4.24 ERA over 120 games. Guerrier last pitched on Friday, when he allowed three runs on four hits in 1 1/3 innings.
"We feel like we're getting better with bringing Chris up," said Dodgers manager Don Mattingly. "Matt is a veteran guy, but we just weren't getting results."
Guerrier was charged with seven runs in 4 1/3 innings over his past five appearances.
"It seemed like he left a lot of balls up in the zone and and didn't seem to be able to locate the ball where he wanted to," Mattingly said.
The Dodgers have 10 days to either place Guerrier on waivers, release him or trade him.
On Saturday, the Dodgers promoted rookie Jose Dominguez from Triple-A and optioned veteran right-hander Peter Moylan. The club also designated infielder Luis Cruz for assignment on Friday when rookie outfielder Scott Van Slyke was activated from the disabled list.
"We're getting a little younger and more athletic," Mattingly said.
Austin Laymance is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.