The D-backs designated the right-hander for assignment following Tuesday's game, giving them 10 days to trade, release or outright him to the Minors. If they outright him, he would need to clear waivers. If a team were to claim him, they would be responsible for the rest of the $2.3 million he is owed this season.
If Galarraga were to go unclaimed, he would have the right to refuse his outright to the Minors, but he would forfeit the rest of the $2.3 million he is owed.
Galarraga was 3-4 with a 5.91 ERA in eight starts this year, and had walked 22 while fanning 28 in 42 2/3 innings.
"It was kind of a breaking point for us, and we just felt it was time to make a change there," D-backs GM Kevin Towers said. "Armando's got good stuff. We saw that in the American League, that was what was attractive about bringing him on here to add depth to the rotation. For him it was just the location of his fastball."
The D-backs plan on activating infielder/outfielder Willie Bloomquist from the 15-day disabled list Wednesday and will eventually bring in a starter to take Galarraga's spot in the rotation.
"We've discussed different options, and once we decide who that is we'll let you know," Towers said. "We're still talking about that."
Following a loss to the Padres on Monday, Galarraga was asked if he was concerned about losing his spot in the rotation.
"No, why would I be worried?" he said. "Something I have to worry about it? You think I have to be worried about it? You think? We'll talk about it at the end of the season. I'm disappointed for this start. I'm not disappointed for the rest of the season. What are you talking about? Are you saying I'm going to lose my job?"
In the end, the D-backs were the ones that said it.