Left-hander John Lannan and right-hander Craig Stammen were scheduled to pitch in the game, but they will now throw in simulated games sometime Thursday. Lannan is expected to throw four innings and will not start until Wednesday against the Astros in Kissimmee, Fla.
The Nationals play their next game Friday afternoon against the Yankees at Space Coast Stadium.
Right-hander Jason Marquis will get the start for Washington, while left-hander Matt Chico is expected pitch in the game.
Fans holding tickets for Thursday's contest against Houston can exchange those tickets for any other Nationals 2010 Spring Training contest, subject to availability.
Bill Ladson is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.