AD ISIDRO METAPANSEATTLE SOUNDERS FC7 p.m., Qwest Field.TV: Fox Soccer Channel.RADIO: 97.3 FM (1210 AM in Spanish).ABOUT CONCACAF CHAMPIONS LEAGUE: The competition brings together 24 club champions from North America, Central America and the Caribbean. Seattle qualified by winning the 2009 U.S. Open Cup. This is a preliminary round pairing, which will be settled by aggregate score over a two-game home-and-road series, with road goals used as the first tie-breaker. The winner advances to the group stage, with the top two teams from four four-team groups moving to the semifinals. Clubs use 18-man game day rosters, three substitutes per game, and yellow-cards accumulate from game to game.ABOUT METAPAN: The club was formed in 2000, when two earlier clubs merged into Asociacion Deportiva Isidro Metapan. It is based in Metapan, El Salvador, and plays at Estadio Jorge Calero Suarez, an 8,000-seat multipurpose stadium. Metapan has won four first-division titles over the past seven seasons. This is its third Champions League appearance. Edwin Portillo has been the manager throughout that run.SIGI SCHMID SCOUTING REPORT: “They are a team that works very hard. That has been the trademark of what everybody says. They are a team that battles for every loose ball and that fights for everything, every square space on the field. They are a team that defends well, that’s how they sort of pushed forward and brought themselves into prominence in the El Salvadorian league. And they are a team that’s been able to score timely goals.” NOTES: This is Sounders FC’s first international competition. … General manager Adrian Hanauer has echoed MLS commissioner Don Garber’s belief that it is important for MLS teams to do well in this competition. However, Schmid’s lineup will be complicated by the MLS match with Colorado last Sunday and another coming up Saturday at San Jose. … Just over 13,000 tickets have been sold. NEXT: The aggregate-score series will conclude at 7 p.m. Tuesday at Estadio Cuscatlan, a 44,000-seat stadium in San Salvador, El Salvador’s capital city about 50 miles from Metapan.