"It's a little sore," Joyce said. "I've been getting treatment all day. I think it's just a case of [being cautious]. Not hurting it worse. As far as doing stuff, I'm going to try and test it and maybe I can pinch-hit later in the game."
Joyce said his back has been tight for the last week.
"Been getting it worked on, playing through it," said Joyce, who missed Sunday's game with flu-like symptoms. "I think maybe being sick got me a little dehydrated. Flying and sleeping in different beds, there are a lot of factors involved.
"You play out in the heat, things like that happen. I felt it really on that third at-bat on the swing that I popped it up. It really grabbed on me and I told them that it kind of tightened up and it grabbed me. And they were like, 'You know what, let's not hurt it worse.'"
Joyce said he has not had an MRI, nor does he expect to have one.
"I told them I don't think it's pulled," Joyce said. "I didn't feel like it was pulled or anything. It just kind of grabbed me. Sometimes that happens."