Cincinnati placed Votto on the 10-day injured list Thursday with left shoulder discomfort.
It's the same shoulder that required a surgical repair last year. Votto got off to an encouraging start when he finally joined the Reds in June, but he is slashing just .167/.262/.296 over his last 61 plate appearances dating back to Aug. 3. There is no timetable for his return from this latest setback.