Greene won't make his scheduled turn through the rotation Thursday against the Padres, Mark Sheldon of MLB.com reports.
The Reds have a scheduled off day Monday, so Tyler Mahle will be bumped up a day in the rotation to start Thursday. Greene's fastball was down 4-to-5 mph during his last start Friday, so there is reason to be concerned. The rookie right-hander has a 5.27 ERA, 1.39 WHIP and 16:6 K:BB over 13.2 innings through three starts and could still start Friday against the Rockies, but that would be a start to avoid anyway with it being in Coors Field.