Brandon Belt (back) returned to action Friday against the Rockies.
Tim Lincecum surrendered four runs in seven innings Friday in a loss to the Rockies.
Giants manager Bruce Bochy indicated Friday that knee surgery is a "strong possibility" for Santiago Casilla.
Pablo Sandoval (illness) is back in Friday's lineup.
Giants general manager Brian Sabean said during a radio interview Thursday that he anticipates "there’s some form of surgery coming" for Santiago Casilla (knee).
Chad Gaudin could get a shot in the Giants' rotation following the injury to Ryan Vogelsong (hand).
George Kontos has allowed six runs on 11 hits and two walks in his last three appearances.
Joaquin Arias has been one of baseball's worst hitters, slashing .205/.262/.205 through 43 plate appearances.
Marco Scutaro went 0-for-3 with two walks Wednesday against the Nationals, snapping his 19-game hitting streak.
Brandon Belt is out of Wednesday's lineup due to back tightness.
Pablo Sandoval is out of Wednesday's lineup against the Nationals due to illness.
Pablo Sandoval hit a walkoff homer off Yunesky Maya in the 10th inning Tuesday as the Giants beat the Nationals 4-2.
Santiago Casilla will have the cyst on his right knee examined by a specialist on Wednesday.
Giants placed RHP Santiago Casilla on the 15-day disabled list with a cyst on his right knee.
Giants placed RHP Ryan Vogelsong on the 15-day disabled list with a fractured right hand.