"It's still bothering me, but we treated it the whole day yesterday," Valencia said. "I still feel it, but it's definitely playable."
Valencia said he can't pinpoint a particular moment when the injury occurred. He said some days are better than others, and it was especially painful when the A's played the Dodgers on Tuesday.
He added he's never had problems with his right leg before and that the issue's been bothering him for the last seven to 10 days.
"Your health is most important," Valencia said. "There's no use going out there without knowing you can perform at a pretty good level."
Melvin said he was willing to have him serve as the designated hitter, but Valencia told him he could play third.
"It's always nice to have him in the lineup," Melvin said, "especially considering how productive he's been for us."
Trevor Hass is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.