SAN FRANCISCO -- A concussion will prevent Giants first-base coach Roberto Kelly from taking the field until at least Game 3, manager Bruce Bochy said Sunday.
Kelly will stay at home to rest after a line drive off his head during Saturday's batting practice left him with a concussion.
Joe Lefebvre, a veteran coach, will take over as the coach for the first two games of the National League Championship Series at AT&T Park.
Game 3 on Wednesday in St. Louis, but there is no guarantee Kelly will be back by then.
"I don't see him being out there at least these two games, if not longer,'' Bochy said a few hours before first pitch against the St. Louis Cardinals. "He's at home. He's resting well. He didn't sleep much last night."
Kelly, 48, was knocked to the ground by a line drive off the bat of Buster Posey during a workout during on the team's off-day. He was down and motionless for several minutes.
Looking woozy, Kelly was helped off the field by the training staff and taken to a hospital for evaluation.
In his absence, the team will turn to Lefebvre, who is in his 18th season in the Giants organization. Listed now as the senior advisor/pro scouting, he also works closely with hitting coach Hensley Meulens.
Lefebvre was the first base coach for the Giants' pennant-winning team in 2002.
Bochy said he's already talked to Lefebvre about some points of emphasis, such as St. Louis catcher Bengie Molina's ability to make snap throws to first base.
Kelly, in his fifth season with the team, also oversees base running and outfield defense.
"Joe will help out with the outfield, too,'' Bochy said. "He'll be in charge of hopefully getting them in the right position."