On Sunday, Black had more of a definitive answer.
"It might be middle of the week," Black said. "It's nearing."
Quentin had a rigorous day going through normal baseball activities before Saturday's game against the Giants. He was set for a slower day Sunday before he gets another full day of work Monday when the team returns to Petco Park.
"He's still got to run the bases and do more intensive fielding drills. Hitting, he feels fine. We're trying to get him up to speed as soon as we can," Black said.
Quentin had arthroscopic surgery on the knee on March 19. He's had no setbacks to this point during his rehabilitation.
Black said Quentin will either play for Triple-A Tucson or Class A Lake Elsinore and will first serve as the designated hitter before eventually moving into the field.