Schmid says the key is shutting down America in the first leg.
"If we can go down there not having given up an away goal here," he said on Monday, "I think that's important for our team. Winning is also important, getting as many goals as we can is important, but really it's about not giving up an away goal. If we don't give up an away goal and win the game, that forces them to come at us down there and opens up the possibilities for us to counter and get an away goal for ourselves."
Schmid minimized the importance of the turf.
“Our advantage is our 30,000 fans -- our 40,000 fans -- that come,” he said. “The turf has played a part in the past but our real advantage is our crowd, our fans and our atmosphere. That’s our advantage.”
Seattle Sounders Probable XI:
Frei; Mears, Evans, Marshall, J.Jones; Alonso, Friberg, Ivanschitz; Morris, Valdez, Dempsey.
CLUB AMERICA. Las Aguilas currently sit in fourth place after seven games of Liga MX's Torneo Clausura but will be without three starters for the first leg against Seattle. Goalkeeper Moises Munoz and forward Dario Benedetto were injured in Saturday's 3-3 draw with Mexico City rival Cruz Azul, while Paraguayan William Da Silva is cup-tied, having played for Queretaro in the group stage.
Benedetto is the big loss, having scored a hat trick in the 4-2 win over the Montreal Impact in Montreal that allowed Club America to win the 2015 Concacaf Champions League, 5-3, on aggregate. America still has veteran Mexican international Oribe Peralta, who shared the 2015 Golden Boot with Benedetto (seven goals in the competition).