He said the left ankle that has bothered him since he made an awkward slide retrieving a ball behind home plate Sunday at Fenway Park is fine, although he described some tightness in the ankle. But besides the ankle, Ruiz also is stuck in a 0-for-22 slump.
Brian Schneider started behind the plate Wednesday against the Yankees at Yankee Stadium.
"I'll be ready tomorrow," Ruiz said, referring to Thursday's series finale.
Ruiz was struggling offensively before he injured the ankle. Phillies manager Charlie Manuel said Ruiz has a long swing. Ruiz said he is working on it.
"I feel like I'm seeing the ball good, but it's something in my mechanics," Ruiz said. "I'll come back tomorrow and hopefully I'll show the swing I had early in the season. It's early. I don't want to put too much pressure on myself. Sometimes you go through it. But I feel fine. I trust my swing. I know I can do it. I've done it before."