Seattle Sounders backup goalkeeper Terry Boss will miss Tuesday's U.S. Open Cup semifinal against FC Dallas after being called up to the Puerto Rico national team for a pair of World Cup qualifiers. This would be Boss' sixth cap with El Huracan Azul. Boss, an Oregon native, became eligible to play for Puerto Rico after spending two seasons with the Puerto Rico Islanders (2006-07).

Puerto Rico will play St. Kitts and Nevis in a Sept. 2 and Canada on Sept. 6. 

Boss has appeared in four competitive match for the Sounders this year, winning all four games. His best game came this week in a 1-0 shut out of Monterrey.