Posey will bat fourth and play catcher. Posey did not play in Saturday's game after being hit by a pitch in the elbow during Friday's contest.
He was likely going to have Saturday off anyway, with a day game following a night game. But his availability for late-inning duties remains in question. Manager Bruce Bochy did say he only expects Posey to miss one game, according to the San Francisco Chronicle
Andrew Susac will be the battery-mate for starter Ryan Vogelsong on Saturday.
Cervelli was 1 for 2 with a triple, a run scored and a strikeout before his ejection. Chris Stewart took over behind the plate.
Grandal returns to the lineup mired in a 3-for-30 slump in his last 10 games (nine starts). He has no extra-base hits, two RBI, one run, five walks and 10 strikeouts in that span.
Grandal has missed the last four games with the injury, which occured when he was struck by a foul ball in his non-throwing shoulder.
"Hopefully, these days give him the best chance of being healthy, or getting as healthy he can be to get to the end of the year," Dodgers manager Don Mattingly said.
Ross is eligible to miss a maximum of seven days and a minimum of three days. The Cubs recalled Matt Szczur to fill his spot on the roster.
He'll get a day off to rest, with Chris Stewart handling the catching on Wednesday.
A.J. Ellis will continue to get reps behind the plate while Grandal is out.