Buck, who started the previous three games, could return by the weekend and doesn't appear to be headed to the disabled list.
"It's still really tight," Buck said. "My hamstring is the anchor of my swing. I can still feel it a little bit in my stance. It's obviously not as bad as I've had in the past, so hopefully I'll get a lot of treatment on it and be back out sooner rather than later.
"It depends on how I feel and if I'll be able to produce, than just throw me out there. I don't want to hurt the team if I feel like I won't be able to have a good swing."
Buck hit in the cage underneath the stands on Thursday, but didn't take batting practice on the field.
"I was kind of feeling for it a little bit and kind of guiding it in the cage," Buck said. "Hopefully they won't need me and they'll score some runs. I want to be out there every day, but you realize what the smart thing is to do."
Buck said the knot in his hamstring is higher on his leg, which is a good sign.
"It's going to take a little bit of work to get in there, but it's more playable than if it was lower in the hamstring," he said.