Both of his appearances have been two-plus innings, with his most recent outing coming Sunday against the Yankees when he finished the game, going two innings and allowing only a solo homer to Nick Swisher.
In observing the adjustment period for Sonnanstine from starter to reliever, Maddon said the quicker the 27-year-old right-hander manages to get loose will determine a lot in regard to how he is used.
"That would be the thing that gets him into more juicy moments," Maddon said, "knowing that I can get him up and get him in quicker, as opposed to having to warm him up like a starter.
"As we move this thing along, I have a lot of faith in him against certain hitters. I don't care if they hit third or fourth in the lineup. He's done some good work against some really good hitters in the middle. We'll see how this goes along. [Lance] Cormier and he have some similar qualities, so it might be a situation where we can bounce them both back and forth to not get them overworked."