North American regional football officials have ended an agreement made in 1991 that allowed for team exchanges with South America for continental football championships.

Chuck Blazer, competition committee chairman for the Confederation of North, Central and Caribbean Association Football (CONCACAF), revealed the break-up on Tuesday in announcing the 12-team line-up for June's CONCACAF Gold Cup event.

US and Mexican teams invited to this year's Copa America, the South American (CONMEBOL) championship, were allowed to participate after having already been announced and promoted as part of the event in Venezuela, Blazer said.

The North American Gold Cup figures to be diminished without the presence of costlier but generally higher-ranked South American squads compared to a field that now includes the unrated French Caribbean island of Guadaloupe.

"The event has risen to the level where it does very much stand on its own as a continental championship," Blazer said.

"We felt this configuration would give us the best competition, everyone playing for real and playing for the right purpose."

But any future North American participation in Copa America is on hold.

"This agreement has ended with this competition since we have no South American teams in the (Gold Cup) compeittion," Blazer said.

"It's not our intention for the program to go forward the way it was. We will sit down with our friends to see what is the best way we can go forward.

"Since 1991 it's a different world and agreements will reflect this in the future."