The Reds selected Vosler's contract Thursday.
Vosler had a strong showing in the Cactus League this spring and might be a regular option between first base and designated for the Reds as the season gets underway. He's actually starting at first base and batting fifth in Thursday's Opening Day game against the Pirates. The 29-year-old posted an .812 OPS in 111 plate appearances last season with San Francisco.