"I think just to get some fresh arms here is important," Angels manager Mike Scioscia said. "Our roster is definitely a living organism right now. It keeps moving, it keeps rotating."
When Buckner appears in a game, he will be the 21st pitcher the Angels have used this season. Buckner has not appeared in a Major League game since he pitched with the D-backs in 2010 and was not on the club's 40-man roster to begin 2013.
In eight starts with Triple-A Salt Lake, Buckner compiled a 4-2 record with a 4.56 ERA.
"I thought I was pitching well," Buckner said. "Got a lot of ground balls, a lot of strikeouts, pitching to contact, trying to stay aggressive. When things are going well, I'm being aggressive."
Brasier had a brief appearance with the Angels earlier this season and allowed two runs in two innings of work.
Although Roth threw two scoreless innings in his last appearance, he had an ERA of 9.00 over 14 innings during his two stints with the Angels this season.
Enright took the loss Monday as he struggled with walks. Enright made four appearances with the Angels, had an 12.996 ERA and failed to pitch into the fourth in either of his two starts.
William Boor is an associate reporter for MLB.com.