"In the seventh inning, [I told the team] 'I'm going to get a hot pack, take something for the pain. if you guys mess this up, come and get me,'" Johnson said.
Werth hurt his knee when he scored in the fifth. The Nationals had the bases loaded with no outs, when Wilson Ramos hit a ground ball to second baseman Chase Utley, whose throwing error allowed Werth and Desmond to score on close plays at the plate.
"The knee is OK. It got caught underneath on the slide at home. It got stiffened up a little bit," Werth said. "The doctors looked at it, they didn't think it was a big deal. It should be OK. [We have a] day off [Monday] and then we'll know more when I wake up in the morning. I don't think it's a big deal."
Werth left the game in the seventh and was replaced by Roger Bernadina. Werth didn't have an X-ray on the knee.
Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the time. He also could be found on Twitter @WashingNats. Andrew Simon is a reporter for MLB.com. Follow him on Twitter @HitTheCutoff. This story was not subject to the approval of Major League Baseball or its clubs.