Originally the team hoped to sit Quentin on Wednesday, take the off-day on Thursday and then join the lineup on Friday, but the pain hasn't gone away.
Quentin took part in some outfield workouts before Saturday's game after sitting out Friday, and Padres manager Bud Black says a trip to the disabled list is unlikely.
"He's doing better," said Black, echoing his comments from Friday. "We'll see about his availability tonight in some form."
Quentin's absence has left the Padres without one of their best and hottest hitters. In the month of July, Quentin had four home runs and a team-best 20 RBIs.
Logan Forsythe -- who homered on Friday -- is replacing him in the lineup in left field, a night after he started in right field.
Quentin's knees have a history of troubling him. He had arthroscopic surgery on his right knee after the end of the 2012 regular season. The Padres have handled him with care this season, trying to give him extra rest whenever possible.
He adjusted his batting stance during the season -- which used to be more crouched and put more stress on his knee -- to a more upright position, and his productivity has taken off since.
Corey Brock is a reporter for MLB.com. Keep track of @FollowThePadres on Twitter. Jamal Collier is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.