Manager Bud Black said Maybin wouldn't be allowed to swing a bat during batting practice but that he could be available during the game against the Giants.
Maybin had one at-bat in Saturday's loss to the Rockies, though that came after he entered the game as a pinch-runner. Otherwise, his last at-bat occurred July 17.
"He's headed the right direction," Black said. "Right now, it's not going to be a stagnant [situation]. He's going to get better."
Another outfielder, Chris Denorfia, wasn't in the lineup Monday because of a sore left shoulder. Black was hopeful he could play Tuesday, especially with the Giants going with a left-handed pitcher, Madison Bumgarner.