Billingsley was shut down last week after feeling discomfort during a bullpen session in San Francisco, and MRI results showed he had tendonitis in his right elbow. He was relieved the news wasn't worse.
"I wasn't really too worried about it. I didn't feel the same things I felt the previous times when I tore my UCL. Something was wrong though. I couldn't throw hard," Billingsley said. "The rehab was going so great, I guess I couldn't escape without something going wrong. Thank goodness it wasn't serious."
Billingsley had PRP injections in 2012 after partially tearing his ulnar collateral ligament. He tried to make a comeback without surgery but that lasted all of two starts in 2013 before having the Tommy John procedure in April. He has pitched in one minor league game on a rehab assignment but left in the second inning with Class-A Rancho Cucamonga on April 6 after feeling discomfort.
The Dodgers begin a nine-game road trip on Tuesday in Minnesota, a journey that will also take the team to Miami and Washington. Billingsley will make the trip, and said he will be cleared to resume his throwing program, which at first will consist of light catch, once the discomfort in his elbow goes away.
"Once that starts, hopefully I'll be able to progress quickly," he said.
Clayton Kershaw threw a bullpen session on Tuesday, which A.J. Ellis and manager Don Mattingly even standing in for a few pitches. Kershaw remains on track for a possible Friday rehab start, though nothing has yet been announced.
Andre Ethier, 3-for-7 with a walk against Phillies starter A.J. Burnett, is sitting tonight because he is sick. "It's just been four or five days of the same stuff," Ethier said. Mattingly said Ethier felt so bad he was unavailable on Monday, but might be available to play Tuesday night if needed.
Alex Guerrero was 3-for-3 with two triples on Tuesday and is 14-for-30 (.467) with seven extra-base hits in nine games with Triple-A Albuquerque. "He's swinging the bat good," Mattingly said. "The main thing is to keep playing defensively. It's part of learning a new position. That kind of stuff doesn't happen overnight. He's played eight games [before Tuesday]."