I searched the current rosters of all 32 teams in the group stages of the UEFA Champions League and compiled a list of the CONCACAF-based players in those squads. To the best of my knowledge it's a complete list:
| Player | Club | Country |
|---|---|---|
| Freddy Adu | Benfica | USA |
| DaMarcus Beasley | Glasgow Rangers | USA |
| Nery Castillo | Shakhtar Donetsk | Mexico |
| Rafael Márquez | Barcelona | Mexico |
| Ricardo Osorio | VfB Stuttgart | Mexico |
| Pável Pardo | VfB Stuttgart | Mexico |
| Carlos Salcido | PSV Eindhoven | Mexico |
| Giovani dos Santos | Barcelona | Mexico |
| David Suazo | Inter Milan | Honduras |
| Lars Hirschfeld | Rosenborg | Canada |
So there are nine players from CONCACAF countries in the Champions League, and even though there are many more American than Mexican players in Europe, there are three times as many Mexican players participating in Champions League football.
As I said in a previous post, I'll post updates on this group's exploits as the European season progresses.
UPDATE (11/8/07): I included Lars Hirschfeld, who I happened to miss the first time around.