With Chicago's defeat of Chivas USA on Thursday, the Columbus Crew wrapped up the 2009 Supporter's Shield. This feat automatically qualified them for next year's CONCACAF Champions League. Earlier this year, the Seattle Sounders grabbed a slot when they defeated DC United for the US Open Cup Title.
The rest of the field will consist of the MLS Cup Winners and runner up, unless the Crew or Sounders are one of those teams. In that case, the slots will be filled by the team with the most points in the 2009 regular season that hasn't already claimed a spot. At his point, that would be one of Houston, Los Angeles, Chivas USA or the Fire, all of whom are knotted at 45 points going into the last weekend of the season.