Tobin Heath, Rose Lavelle, Sam Mewis, Alex Morgan and Christen Press are all playing in England and will not join the camp.
The Dash don't have a rich history, but Houston has found an identity worthy of a team playing for the NWSL championship against Chicago on Sunday.
The Chicago Red Stars edged past Sky Blue 3-2 in a thrilling last-four encounter of the NWSL Challenge Cup on Wednesday.
With the dominant defending NWSL champion Courage out, the Red Stars, Dash, Thorns and Sky Blue look to rewrite history in the semifinals.
The one-month NWSL season tournament, made necessary by the coronavirus pandemic, is short but no less taxing on the players' bodies and minds.
Sky Blue will play the Chicago Red Stars, who also advanced 4-3 on penalties after a scoreless draw with OL Reign in Saturday's late match.
Carli Lloyd will miss the upcoming NWSL Challenge Cup because of a knee injury, Sky Blue FC announced on Monday.
The Portland Thorns' victory over Sky Blue FC on Wednesday was interrupted four times as players were given breaks because of poor air quality.
She's been hailed as the world's best female player and now Sam Kerr could have it officially confirmed by FIFA.