SAN FRANCISCO -- Buster Posey's mildly strained left elbow kept him out of the Giants' lineup for the second day in a row Sunday, though manager Bruce Bochy sounded hopeful that the rookie catcher could return for Monday's series opener against the Colorado Rockies.

Posey said that he felt "all right" after hitting balls off a tee on Sunday morning. But the Giants maintained a cautious approach.

"We feel he needs another day [off] so he doesn't re-injure it or make it worse," Bochy said.

Posey, batting .329 with 10 home runs and 49 RBIs, hurt himself during his second at-bat Friday night against Arizona.

The Giants own a 43-32 record in the games Posey has started, including 27-18 when he catches.

Runzler to return when rosters expand

SAN FRANCISCO -- Manager Bruce Bochy continued to divulge little information regarding the Giants' September callups, though he did say Sunday that left-hander Dan Runzler will end his injury rehabilitation assignment and be activated from the disabled list.

That will likely happen on Wednesday, when rosters can be expanded to 40 players.

Runzler, who dislocated his left patella on July 8, has compiled a 3.00 ERA in five appearances with Triple-A Fresno, with two walks and four strikeouts in six innings. Runzler also struck out two in a scoreless inning for San Jose in one of his other rehab stints.

Right-hander Chris Ray (right intercostal strain) will return on Friday, since the first day he's eligible to leave the DL is Thursday's scheduled off-day. Ray threw off a bullpen mound on Saturday for the first time since injuring himself on Aug. 17 and felt fine.

Bochy hinted that another pitcher could be summoned from the Minors.

Shortstop Edgar Renteria (left biceps) also could return from the DL on Wednesday. Position players who possibly could be added from Triple-A to provide speed and depth include utility men Eugenio Velez and Emmanuel Burriss.

Ramirez has been a Giants staff-saver

SAN FRANCISCO -- Ramon Ramirez appeared due for a break Sunday after appearing in the Giants' four previous games, as manager Bruce Bochy indicated that the right-hander would pitch only in an emergency.

It was a well-earned break for Ramirez, whom San Francisco acquired from the Boston Red Sox at the July 31 Trade Deadline.

Ramirez's durability has been an asset. He has consumed innings while opponents have scored 34 runs in the last four games, helping Bochy preserve the arms of other relievers. In his last five appearances, Ramirez has logged outings of 1 2/3, two and 2 1/3 innings. Despite allowing two runs in the two-inning stint, he owns a 1.13 ERA in 14 games as a Giant.

Bochy said that he received favorable reports about Ramirez from Boston manager Terry Francona. "He said that he's resilient and he'll take the ball every day," Bochy said. "Not just take the ball, but maintain his stuff. It seems like he's better with more work."