GO:0090201

Any process that decreases the rate, frequency or extent of release of cytochrome c from mitochondria, the process in which cytochrome c is enabled to move from the mitochondrial intermembrane space into the cytosol, which is an early step in apoptosis and leads to caspase activation. [GOC:BHF, GOC:dph, GOC:mtg_apoptosis, GOC:tb]