SAN FRANCISCO — While general manager Brian Sabean attempts to add more players, injuries are subtracting others.

The Giants got bad news on three health fronts Tuesday.

Left-hander Randy Johnson's strained rotator cuff was diagnosed as a tear, and the Giants moved him to the 60-day disabled list. If Johnson returns at all, it couldn't be earlier than Sept. 4.

Also, outfielder Nate Schierholtz was placed on the 15-day DL because of a bruised and strained left hip that has gotten progressively worse.

And perhaps most critically, shortstop Edgar Renteria revealed to MediaNews that he would have surgery after the season to address a painful bone spur in his right elbow.

Renteria, who didn't start Tuesday night against Pittsburgh but is expected to play this afternoon in the series finale, had an MRI on Tuesday that revealed the spur. The injury affects him in the field and at the plate, but he plans to play through the pain, helped by occasional cortisone shots.

"I'll have to deal with it," Renteria said. "I'm here to help the Giants. If I don't play and we miss the playoffs, I'll feel bad."

Renteria said the injury bothers him more at the plate.

"Throwing, it's not the same, but I can handle it better than hitting," said Renteria, adding a move to second base wouldn't help. "I try to use more of my shoulder to throw, but it takes a little longer. I can't be as quick as I want to be."


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'Speed bump'

Johnson won't pick up a baseball for three weeks as he works to strengthen the small muscles in his left shoulder, but the 45-year-old pitcher called the injury a "speed bump" — not the end of the road.

"I came here to win games. That's my intention still," the 303-game winner said. "Hopefully I go out in some capacity and contribute, whether it's starting or relieving."

Johnson was encouraged by improvement in three weeks since he injured his shoulder while swinging a bat July 5. He hopes three more weeks will do the trick.

"I've had a lot of surgeries, and I've rehabbed a lot," said Johnson, although this is the first involving his pitching arm. "I'm a hard worker and I'm in good hands."

Catch turns ugly

Schierholtz crashed into the chain link fence while making a highlight catch Thursday at Atlanta's Turner Field, leaving him with an ugly bruise over most of his upper leg.

He played the next day at Colorado and hit a home run, but the injury continued to stiffen up. He wasn't expected to be available for another six to eight days, manager Bruce Bochy said.

— Andrew Baggarly