"He's not going to play the rest of the weekend, which will then lead us to the workouts in between Sunday and Thursday," Hinch said. "We'll do some simulated stuff. We think he's going to be fine. We wanted to get our doctors' eyes and hands on him as soon as possible."
• Dress for October: Shop for official AL West champs gear
While the Astros are concerned with Reddick, they still expect him to be ready for the playoffs, which begin Thursday at Minute Maid Park with Game 1 of the ALDS.
"I think Josh Reddick could play today in a little bit of discomfort, which is not going to happen," Hinch said. "There's no reason for us to risk the playoff series at this point. We wanted him to play, we thought he was going to be able to play. We'll know more as our doctors see him tomorrow."
Reddick was initially worried when he woke up Thursday because his back was sore, the result of an awkward sleep during the team's plane ride to Boston from Dallas late Wednesday. He was hoping to play this weekend, but the Astros have enough outfield depth to finish the regular season without him.
Reddick, who signed a four-year, $52 million deal with Houston in November, finishes the regular season with a .314 batting average, 13 homers and 82 RBIs in perhaps the best season of his career. His .847 OPS is a career high. He hit .391 in September, which ranks near the top for batting average this month in the Majors.
Brian McTaggart has covered the Astros since 2004, and for MLB.com since 2009. Follow @brianmctaggart on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.