The shoulder pain worsened, eventually tacking off some velocity while adding more runs to his ERA. So on Tuesday, the Angels placed Coello on the 15-day disabled list with shoulder inflammation, recalling reliever Dane De La Rosa -- 4.05 ERA in 27 appearances earlier this year -- to take his spot in the bullpen.
Coello, who will undergo further evaluation in Southern California on Thursday, used his fastball, curveball and hybrid forkball-knuckler to pitch 13 1/3 innings of one-run ball to start his Angels career, striking out 19 batters and walking only two in that span.
But the 28-year-old right-hander has been charged with three earned runs in two-thirds of an inning in each of his last two appearances, on Wednesday against the Cubs and on Sunday against the Red Sox. In that time, his fastball velocity also dropped ever so slightly, from 92-93 mph to 90-92.
"I haven't felt anything coming out," said Coello, who has no history of shoulder issues but did miss the last three months of last year with a sore elbow. "The velocity has dropped a little bit, and I just have no finish."
Alden Gonzalez is a reporter for MLB.com. Read his blog, Gonzo and "The Show", and follow him on Twitter @Alden_Gonzalez. This story was not subject to the approval of Major League Baseball or its clubs.