Quintana, 31, has been out with a lat injury after missing time to start the season with a cut on his hand.
"He's been getting stretched out," Ross said. "I want to give him a little bit of leash and communicate with him in-game."
Quintana has only thrown six innings this season between the two injuries. He's been a mainstay in the Cubs rotation, and with fellow starter Tyler Chatwood out with an elbow ailment, the team has been in need of innings from the rotation. His role in the playoffs might be determined by his outing on Tuesday and then possibly in the team's regular-season finale on Sunday.
"We're going to go with the best pitchers for the postseason," Ross said. "Before I comment on that [Quintana's role], I'd like to see him pitch in a real game."
"My arm and body [are] really good right now," he said. "I can't wait to be a starter for the first time in 2020."
Quintana is expected to be a free agent in the offseason.
"My expectation is to be ready to do my job. I don't know what comes for me after [Tuesday]," he said. "I'm ready for whatever role they need me."