The Nationals don't intend to announce tomorrow's starting pitcher until tomorrow morning because they need to make a corresponding roster move.
But manager Jim Riggleman said he would let Marlins skipper Fredi Gonzalez know in advance as a courtesy. And the Marlins' game notes currently list Matt Chico as tomorrow's starter.
Infer from that as you will.
UPDATE AT 6:31 P.M. -- Here is the full story on Chico's return on CSNwashington.com.