Chad Billingsley smiled through a news conference in the Dodgers' dugout. He cracked jokes. His optimism appeared genuine.

But on the day his season was declared over, Billingsley also acknowledged that the ulnar collateral ligament in his right elbow could require Tommy John surgery if it does not improve after receiving a second platelet-rich plasma (PRP) injection Wednesday.

"There's some slight tearing going on in there," he said, "so that's not good."

The Dodgers transferred Billingsley to the 60-day disabled list and added Double-A pitcher Steven "Paco" Rodriguez to the 40-man roster.

The move was not unexpected and was confirmed to Billingsley by Dr. Neal ElAttrache on Monday night.