Soto was optioned to Triple-A Charlotte on Wednesday.
The dream of a Soto-Soto battery on the south side won't happen on Opening Day, but the 25-year-old southpaw still performed decently with his new ball club in his limited spring performances. Soto has had some success at the Triple-A level and does have 3.1 scoreless MLB innings to his credit, so a return to Chicago isn't out of the question if his performance in Charlotte warrants it.