Fife said he felt discomfort in his shoulder after his start on Sunday in Baltimore. Fife started in place of Chad Billingsley, who is out for the season following Tommy John surgery on Wednesday, and threw 80 pitches in 4 2/3 innings. He had an MRI on Tuesday in New York. Fife threw again on Friday in Los Angeles, but experienced discomfort and the Dodgers decided a DL stint was necessary.
"I'm just going try and take it in stride, but I'm definitely not that excited to miss an opportunity," said Fife, who had a similar injury in 2009.
Fife is taking anti-inflammatory medication and will not throw for a few days.
Magill, ranked No. 7 among the Dodgers' top prospects, pitched 19 innings in four starts with Albuquerque this season, posting a 2.84 ERA with 23 strikeouts. He has a career 3.77 ERA in six seasons in the Minors.
Magill, 23, is the ninth starter for the Dodgers in 23 games. The last time the organization used that many starters this early in a season was in 1942, when the Dodgers played in Brooklyn and used 10 starters in 22 games.
Dodgers manager Don Mattingly would not say if Magill would be in line to make another start after Saturday. Chris Capuano (calf strain) is scheduled to make a Minor League rehab start on Wednesday, and the left-hander could be activated from the DL next week. The Dodgers have an off-day on Thursday, and don't need a fifth starter until a three-game series against Arizona May 6-8.
Other Dodgers pitchers to spend time on the DL this year include: Billingsley, Capuano, Scott Elbert, Zack Greinke, Ted Lilly and Shawn Tolleson.
Lilly was activated on Wednesday and made his first start since last May.
Austin Laymance is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.