Outfielder Chris Coghlan and lefty reliever Mike Dunn were optioned to Triple-A New Orleans on Sunday after Miami lost, 8-4, to Arizona at Marlins Park.
The team has recalled outfielder Bryan Petersen and lefty Dan Jennings from New Orleans, and both are expected to be available for Monday's series finale against the D-backs.
Coghlan made the Opening Day roster as a left-handed-hitting backup outfielder who could play all three positions. The 2009 National League Rookie of the Year went 4-for-34 (.118) in 19 games.
Dunn was tagged for three runs in two-thirds of an inning on Sunday, and his ERA rose to 9.53 in 5 2/3 innings over eight appearances.
"What I learned last year is, when you start losing, there are a lot of guys' jobs that are in jeopardy," Coghlan said. "It's a cut-throat business. That's what happens."
At New Orleans, Coghlan will get regular playing time, which is something he welcomes.
"The biggest thing about getting sent down is I can play," Coghlan said. "It's a good thing. I had to deal with it last year for the first time. This year, it's different. It's easier. It's tough, because this is where you want to be. This is where I know I can play, and it's the echelon where everybody wants to be.
"But it's going to be a good thing for me in the long run. I'm going to go down there and play. When you're playing every day, you never know what is going to happen."
Petersen, who can play all three outfield positions, certainly benefited from regular playing time at New Orleans. A left-handed hitter, he batted .316 in 76 at-bats for the Zephyrs.
Jennings is being called up for the first time in his career. The lefty has a 2.08 ERA with 10 strikeouts in nine appearances and 8 2/3 innings.