SAN FRANCISCO -- Manager Bruce Bochy said Saturday that he's still leaning toward adding right-hander Ryan Vogelsong to the starting rotation during the Giants' upcoming three-game series at Pittsburgh, which begins Tuesday.

Bochy noted that Monday's scheduled off-day would allow the Giants to stick temporarily with the four-man contingent they used this week following Barry Zito's right foot injury, since each starter still would receive four days' rest. The Giants wouldn't need a fifth starter until April 30 at Washington.

But Bochy indicated that if the Giants can avoid using Vogelsong excessively in relief, as they did Friday when he pitched 3 1/3 shutout innings, they'll resume using a five-man rotation sooner than later.

"We'd like to give guys an extra day [of rest]," Bochy said.

Vogelsong, a non-roster invitee to Spring Training, has allowed three hits without walking a batter in 4 2/3 shutout innings spanning two appearances.

Lefty Sanchez expects to make start despite flu

SAN FRANCISCO -- Left-hander Jonathan Sanchez revealed that he has been feeling the effects of the flu, but intends to make his scheduled start in Sunday's series finale against the Atlanta Braves.

Sanchez said he was so dehydrated that he required intravenous fluids Saturday. But, he said, "I pitched this way [with the flu] last time in Colorado. Let's see how I can do this time."

Sanchez allowed the Rockies three runs and two hits in 6 1/3 innings while earning the decision last Tuesday as the Giants won, 6-3.

Manager Bruce Bochy remained optimistic about Sanchez.

"I think he's going to be fine," Bochy said.

Torres, Casilla headed for rehab in Arizona

SAN FRANCISCO -- Manager Bruce Bochy said Saturday that outfielder Andres Torres and right-hander Santiago Casilla will intensify rehabilitation of their respective injuries at the Giants' training complex in Scottsdale, Ariz., while the team is on its upcoming three-city, 10-game trip.

This plan eliminates any possibility that Torres, the Giants' Opening Day center fielder and leadoff hitter who's nursing a strained left Achiiles tendon, will be activated from the 15-day disabled list when he's eligible next Monday.

"I think he's still a little ways away," Bochy said of Torres, who has resumed hitting and light running.

Casilla threw 20 fastballs in the bullpen Friday, marking the first time he had thrown off a mound since he went on the disabled list April 6 with an inflamed throwing elbow.

Bochy said that both Torres and Casilla might participate in extended spring training games during their Arizona stint.