Quentin, who has just four at-bats in the Padres last nine games, tested his knee during pregame drills before the start of a three-game series against the D-backs on Tuesday.
"I'm going to go out and get a lot more activity," Quentin said prior to batting practice. "If it responds well, then we'll be closer."
Quentin, who had surgery on the knee in March and didn't make his first appearance until May 28, is having pain in the knee when he's in his hitting stance and when he puts weight on the knee.
Quentin was asked that if opting to shut himself down and rest the knee the remainder of the regular season was an option.
"It's important to finish on the field with my teammates," he said. "I'm looking forward to getting back out there."
San Diego manager Bud Black said there was a chance that Quentin could be available to pinch-hit in the game on Tuesday.
"He's gaining on it," Black said. "That's a good sign."