The Nationals selected Crews' contract from Triple-A Rochester on Monday.
The top prospect is ready to make his major-league debut Monday against the Yankees after slashing .270/.342/.451 with 13 home runs and 25 stolen bases this season between Double-A Harrisburg and Rochester. Crew has played both center field and right field but would appear likely to see most of his action in right for the Nationals with Alex Call (foot) recently landing on the injured list.