"It felt way better than [Tuesday], so it's improving," he said.
Sanchez, a non-roster invitee who started at shortstop on Opening Day last year, was able to field ground balls at shortstop, second base and third base, but not at full speed. Houston manager Brad Mills would like to be able to get him on the field soon at full speed.
"His back is still real tight and the doctors don't feel comfortable letting him go with it," he said. "We're still taking nice and easy ground balls right at him, but it's putting him behind the eight ball because it's not giving him an opportunity to take ground balls and take swings. We're not going to rush him because we want to make sure he's 100 percent."
Sanchez hit .240 with 10 doubles and 28 RBIs last year, making 41 starts at shortstop, 14 at second base and eight at third base.