PHILADELPHIA -- Madison Bumgarner almost surely will start Game 4 of the National League Championship Series for the Giants on Wednesday. Tim Lincecum won't.

But manager Bruce Bochy emphasized that neither element has anything to do with the blistered finger on Lincecum's throwing hand that bothered him in Game 1 of the Division Series against Atlanta.

"He's been fine," Bochy said of Lincecum, who's all clear to start NLCS Game 1 on Saturday against the Philadelphia Phillies.

Wednesday, Bochy said that Bumgarner was "penciled in" as the Game 4 starter. The manager underlined Bumgarner's name with his remarks Thursday. Bumgarner proved that he's ready for playoff prime time by earning the decision in the Giants' Division Series-clinching triumph in Monday's Game 4 at Atlanta.

Bochy still left open the possibility that he could "call an audible" for Game 4, meaning that Lincecum conceivably could pitch on three days' rest.

Giants could use Zito in long-relief role

PHILADELPHIA -- Giants manager Bruce Bochy continued to leave open the possibility that left-hander Barry Zito could be named to the Giants' National League Championship Series roster to fill a long-relief role.

"That's what we're talking about," said Bochy, who has been discussing the matter with general manager Brian Sabean, pitching coach Dave Righetti and bullpen coach Mark Gardner.

Whether to add Zito or a short reliever such as left-hander Dan Runzler -- who could prove handy to help neutralize the Phillies' left-handed-batting core of Chase Utley, Ryan Howard and Raul Ibanez -- are decisions that will challenge the Giants' braintrust before Saturday's 10 a.m. PT deadline for setting the roster. Bochy said that he'll continue to use an 11-man pitching staff.

Giants hold brief optional workout indoors

PHILADELPHIA -- The Giants had a low-key day Thursday, holding a brief optional workout at Citizens Bank Park after flying in from San Francisco.

"A lot of guys wanted to come and get a few swings and get in a little throwing," manager Bruce Bochy said.

Showers prevented hitters from taking outdoor batting practice, so they used an indoor batting cage. Left-hander Jonathan Sanchez, the Giants' Game 2 starter, threw the equivalent of a between-starts bullpen session in that cage to stay sharp.