The Nationals are expected to recall Cornelio from Triple-A Rochester on Sunday, Spencer Nusbaum of The Athletic reports.
Cornelio will make his way back up to the big-league club ahead of Sunday's series finale versus the Diamondbacks after being demoted to Rochester on April 24. The 26-year-old has posted a 4.87 ERA, 1.35 WHIP and 64:26 K:BB in 44.1 innings at the Triple-A level this season.