Quintero played catch from about 60 feet before Wednesday's game against the Reds, and he performed better than he expected.
"I felt better," Quintero said. "Before I threw, I was a little scared. But it felt fine."
Quintero was injured in the fourth inning of Friday's game against Milwaukee when he and Brewers outfielder Mike Cameron collided on a play at the plate. As Quintero caught the ball up the third-base line, Cameron slammed into him and injured Quintero's shoulder. Quintero held onto the ball for the out.
But in the past few days, Quintero has progressed.
"I was surprised he was [throwing]," Astros manager Cecil Cooper said. "He said he felt much better today."
Josh Katzowitz is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.