Littell will work in bulk relief during Saturday's game against the Pirates, Mark Zuckerman of NatsJournal.com reports.
Carson Palmquist will open the game for the Nationals but is likely to cover an inning or two before Littell takes over. Littell has notched a 3.42 ERA and 1.18 WHIP in 23.2 innings following an opener this season and a 6.07 ERA and 1.42 WHIP in 56.1 innings as a traditional starter.