USA midfielders Robbie Rogers and Kyle Beckerman are set to train with Bundesliga club Kaiserslautern after coach Jurgen Klinsmann organised the arrangement.
A second-half equaliser from Robbie Rogers ensured Jurgen Klinsmann's debut match as USA coach ended all square against rivals Mexico.
San Jose Earthquakes upset New York Red Bulls to book a date with Colorado Rapids, who beat Columbus Crew on penalties, while FC Dallas eliminated Real Salt Lake to secure a meeting with Los Angeles Galaxy.
After a 2-1 second-leg victory against Columbus Crew, Colorado Rapids needed a penalty shootout to reach the Eastern Conference final, while FC Dallas beat Real Salt Lake 3-2 on aggregate to book their place in the Western Conference final.
Only four teams will finish the weekend alive in the race for gold in the USA, while play-off places will be claimed in Mexico and the regular season will reach its conclusion in Korea Republic.
Join FIFA.com for a closer look at the weekend's last-eight fixtures in the CONCACAF showpiece, which bring tough tests for both Mexico and USA.