Quintero suffered the injury after Mike Cameron, attempting to score from second, pummeled the catcher while trying to knock the ball out of his glove. Quintero fell violently to the ground, knocking his shoulder and his head, but he hung onto the ball for the out.
He came out of the game but said later he felt fine. He felt quite differently, however, the next day.
"Yesterday, I didn't feel anything -- no pain," Quintero said. "When I woke up in the morning, it hurt a lot. I cannot throw, and I cannot hit."
Manager Cecil Cooper said he "half-expected" Quintero to be placed on the DL.
"He couldn't get his arm up," Cooper said. "I'm not surprised. Q's pretty tough, but I'm not surprised. That was a pretty good lick that he took, and he delivered."
Quintero said he had not heard from Cameron since the incident, but when approached by reporters Saturday, the Brewers outfielder asked about Quintero's condition.
"How's my man over there doing?" Cameron said. "I was a little dazed, but I was fine."
Asked if he was surprised Quintero held onto the ball, Cameron said, "He had time to secure himself. I'm kind of glad it happened like it did, or I would have killed him [had Quintero not been prepared for the impact].
"Once [third-base coach Brad Fischer] sent me, I knew it would be close. [Quintero] was so far up the line. I'm not doing that hook slide [stuff]. If he was at the plate, I would have slid. The score was 0-0. If we had five runs, you never know. I don't know [what I would have done]."
Towles, who missed a few games after taking a foul ball off his lower eye area, was expected to be in uniform for Saturday's game. The catcher was hitting .344 [11-for-32] with one homer and three RBIs over 11 games for Round Rock at the time of his recall.
Geoff Blum is considered to be the emergency third catcher, and Cooper mentioned Jason Smith as an option as well.