Werth was originally hitting third in the Potomac Nationals' lineup on Friday night -- along with Xavier Nady and Chad Tracy -- but was still at Nationals Park around 4 p.m.
"The weather, and he was a little stiff but his doctor said that's to be expected," manager Davey Johnson said. "That's a good sign. He said he pushed it to the point where it got a little stiff, and said once you get that, you're good to go. He said he heated it up in here and after a few exercises, he felt great.
"So he's going tomorrow. No biggie."
Werth, who broke his left wrist diving for a ball on May 6 in Philadelphia, took batting practice for the first time earlier this week and seemed to be ahead of schedule. But his targeted return date of the first week in August will likely remain the same, with the outfielder taking a more extended approach in his rehabilitation to fully regain his timing before he joins the first-place Nats.
Werth hit 20 home runs and drove in 58 while batting .232 in a disappointing 2011 campaign in his debut with Washington last season.