The roster includes players 12 European-based players and 10 from MLS teams eliminated from the playoffs.
Dax McCarty, one of three FC Dallas players called up, earned his first callup. Contrary what was earlier reported out of Mexico, New Mexico product Edgar Castillo, who previously played for Mexico, is not in the squad. Nor is Pachuca's Jose Francisco Torres. (Mexico has league games this weekend.)
After Saturday's Slovakia game (TV: FSC and Galavision, 10 am ET), the USA heads to Denmark for a game Oct. 18 (TV: ESPN networks, 2:30 pm ET).
"These matches present a terrific opportunity to continue building on the nucleus of our team, and at the same time evaluate more of the player pool against very good opponents," said Coach Bob Bradley. "We are very pleased with what we have accomplished in a long and challenging year, and we move forward with the goal of getting ourselves ready to be a competitive team in the World Cup."
GOALKEEPERS: Brad Guzan (Aston Villa), Marcus Hahnemann (Wolverhampton), Troy Perkins (Valerenga)
DEFENDERS: Carlos Bocanegra (Rennes), Jonathan Bornstein (Chivas USA), Steve Cherundolo (Hannover), Jimmy Conrad (Kansas City Wizards), Clarence Goodson (IK Start), Frankie Hejduk (Columbus Crew), Chad Marshall (Columbus Crew), Heath Pearce (FC Dallas), Jonathan Spector (West Ham)
MIDFIELDERS: Michael Bradley (Borussia Moenchengladbach), Clint Dempsey (Fulham), Benny Feilhaber (AGF Aarhus), Sacha Kljestan (Chivas USA), Dax McCarty (FC Dallas), Robbie Rogers (Columbus Crew)
FORWARDS: Jozy Altidore (Hull City), Conor Casey (Colorado Rapids), Jeff Cunningham (FC Dallas), Eddie Johnson (Fulham)