Motter will play first base and bat sixth in Tuesday's game against the Nationals, Shannon Drayer of 710 ESPN Seattle reports.
Motter was originally slated to watch the game from the dugout, but with Danny Valencia (wrist) being scratched from the contest, Motter was thrust into action. The 27-year-old utility man could see some extra playing time while Valencia is sidelined, but he could see the bench more frequently now that Robinson Cano is back from injury.