Los Angeles Angels right-hander Garrett Richards hasn't been cleared to resume throwing, and the team does not plan to activate him from the 10-day disabled list on Sunday when he's eligible to come off.
Richards was diagnosed with a strained right biceps last week. When doctors clear him to throw, Richards could need a minor league rehab assignment to build arm strength.
"They'll let us know when he's ready to pick up a ball," Angels manager Mike Scioscia told reporters on Thursday. "The longer he's out, obviously, there would be more rehab involved."
Richards missed most of last season because of a partially torn elbow ligament but chose rest and stem-cell injections over Tommy John surgery. He made it through spring training solidly but left his season-opening start at Oakland in the fifth inning on April 5 because of pain in his arm.
He won 28 games over the 2014 and 2015 seasons but was limited to six starts last year.
Information from The Associated Press contributed to this report