"We're talking about [which of the two it will be]," Maddon said. "We have to adjust things a bit within the bullpen to fill that day up. We're not ready to reveal exactly what we're doing, but we're talking about it."
The Rays need a spot start Saturday due to Wednesday's doubleheader against the Yankees.
Maddon said the decision will have to be made prior to the second game of Wednesday's day-night doubleheader. Many considerations are involved, and one of the most significant is the number of innings each has pitched this season. Minor Leaguers finish their seasons in early September, at the latest, so each is pushing the envelope with the number of innings they are pitching at this time of the year.
"It's a balancing act," Maddon said. "Of course we're going to do everything we can to win the game. But we're always going to keep one eye on the future here, too. And the last thing I would ever want to do is hurt one of these kids."