Billingsley returned to Dodger Stadium, where he was examined by Dr. Neal ElAttrache while the Dodgers were playing the Giants.
"We were concerned, but we got good news during the game," Mattingly said. "Doc looked at it, and felt good about it."
The Rancho Cucamonga start was one of five planned in Billingsley's road back to the big leagues. It's not known how this setback will alter that plan.
Billingsley was not available for comment after the Major League game. He retired San Jose on eight pitches in the first inning, but had to come out three batters into the second after throwing 18 pitches in 1 1/3 innings. Billingsley was scheduled to throw two innings or 25 pitches.
Ken Gurnick is a reporter for MLB.com. Earl Bloom is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.