Reds manager David Bell said Friday that Stephenson is day-to-day with an undisclosed injury, Chris Renkel of Local 12 in Cincinnati reports.
Stephenson was behind the plate Monday and served as the team's designated hitter Tuesday, but he's now missed two straight games sandwiched around Thursday's team off day. It's not clear exactly what Stephenson is dealing with, but the Reds brought up Austin Wynns as insurance at catcher.