The 37-year-old Ramirez was out of the starting lineup for a second consecutive game on Monday, and manager Joe Torre revealed his left fielder has a tight hamstring he felt during Saturday night's game, when he reached base in all five plate appearances.
Torre said Ramirez, who was intentionally walked as a pinch-hitter Sunday when he had a scheduled day off, was available to pinch-hit Monday.
"It doesn't seem very serious," said Torre.
Torre also said that third baseman Casey Blake flew to Los Angeles after Sunday's game to have his lingering left hamstring strain examined Monday by Dr. Neal ElAttrache. Blake has missed five games for the second time in a month with the hamstring.
"It just hasn't gone away," said Torre. "Yesterday he went to run and felt tightness and that's why we sent him back last night. He'll join us in San Diego [Tuesday]."
Infielder Ronnie Belliard also was unavailable Monday after feeling a twinge in his left groin rounding first after his ninth-inning single Sunday. Belliard told trainer Stan Conte that it felt better on Monday and he is expected to miss only a few games.
Torre was asked if he was concerned with the sudden rash of injuries and the playoffs around the corner.
"I'd be more concerned if it was a week from now," he said. "Those things you can't do anything about it. All clubs go through it. It's pretty much what happens with the length of the season. Guys are worn down. You hope it's not a big deal."
Torre replaced Ramirez in the lineup with Juan Pierre, who batted leadoff as shortstop Rafael Furcal had a scheduled day off. Juan Castro replaced Furcal at shortstop and Brad Ausmus caught for Russell Martin, who also received a scheduled day off. Mark Loretta started at third base.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.