Rivero (hand) began a rehab assignment Saturday and has gone 3-for-7 with a home run in his first two rehab contests.
Rivero played one rehab game in the rookie-level Arizona Complex League before being moved up to Single-A Rancho Cucamonga on Tuesday. The catcher has been out since early June following left hamate bone surgery. It's not a given that Rivero will be returned to the Angels' roster once he's physically ready.