Your browser does not support iframes. SAN FRANCISCO — Giants first-base coach Roberto Kelly stayed home Sunday because of a concussion and won't work until at least Game 3 of the NLCS, manager Bruce Bochy said. In his place, Joe Lefebrve, an assistant hitting coach who coached first base for the Giants during its 2002 World Series season, will do so again for Games 1 and 2. Buster Posey hit Kelly, 48, in the head with a line drive during a team workout at AT&T Park. Kelly was knocked woozy and needed help leaving the field. "Roberto will not be on the field. He's got a concussion," Bochy said. "I don't see him being out there at least these two games, if not longer. He's at home, he's resting well [but] he didn't sleep much last night. He hasn't come in yet. Dave Groeschner, our trainer, and I were hoping he could come in so they could check him out again." A first-base coach is easier to replace than, say, a pitching coach, but it'll still take some getting used to for the Giants. And their minds, from time to time, will be on Kelly. But the players are familiar with Lefebvre (pronounced "Le FAY"), and he knows the job. One thing he'll have to remind base runners: That...