Trinidad & Tobago will replace Guatemala in the men's tournament at the Pan American Games in Guadalajara, Mexico.
Guatemala was withdrawn by the country's Olympic committee for non-compliance with protocol.
Panama and Honduras, who finished behind Guatemala and ahead of Trinidad in the final rankings of the CONCACAF Under-20 Championship in April, declined invitations to fill the vacancy in the eight-team competition, set for October 19-28.
Trinidad will be placed in Group A along with Ecuador, Mexico and Uruguay and begin play October 19 against Uruguay.