"He's not throwing the baseball yet, but his rehab is going well," Angels manager Mike Scioscia said of Coello, who is still in Arizona.
The 28-year old is currently on the disabled list with right shoulder inflammation, but previously acknowledged progress in his shoulder.
"So far, it's feeling better. Better movement, rotation," Coello said on July 6. "It's all like everybody says, build up until I start throwing again and then we will see where we're at."
Although Coello is progressing, there is still no timetable as to when he could begin a throwing program.
Coello has not pitched since June 9 because of the injury, but had posted a 4.30 ERA in 14 2/3 innings this season.
William Boor is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.