De Leon will not start Sunday against the Cubs, Alanna Rizzo of SportsNet LA reports.
He will be passed over in favor of Brock Stewart, whom manager Dave Roberts said gives the team the "best chance to win." De Leon has been trying his best to force the Dodgers' hand, turning in back-to-back 10-strikeout, zero-walk performances with Triple-A Oklahoma City, but the team continues to hold off on adding him to the 40-man. The right-hander could finally come up in September.