Polanco developed a back spasm on Saturday, and he has taken it easy for a few days. On Tuesday, Polanco said he was feeling better, and he did some drills on the back field.
"He's going through a full-days' activities, and he should be good tomorrow," manager Mike Redmond said. "The plan is for him to play third tomorrow. He should be fine."
Polanco believes the wave of cold weather that swept through the area over the weekend may have caused his back to tighten. On Saturday, he worked out on a back field and was fine, but later that night, he experienced a spasm.
Last season with the Phillies, Polanco was on the disabled list with lower back inflammation. He said the spasm is not related to his injury last year.
Polanco, a free-agent signee, was brought in to provide a veteran presence to a young team.
Another veteran has dealt with a mild ailment. Greg Dobbs has a right calf strain.
On Tuesday, Dobbs did drills on the field, taking ground balls at third base.
"He should be good to go in a couple of days too," Redmond said.
Joe Frisaro is a reporter for MLB.com. He writes a blog, called The Fish Pond. Follow him on Twitter