Honduras beat Mexico on Wednesday, a result which sends both sides through at the expense of Jamaica. T&T join them in the last six.
Wednesday will see a dramatic finale in CONCACAF as Mexico, Honduras, Jamaica, T&T and Guatemala chase places in the final round.
El Salvador advanced to the final round of regional qualifying for the FIFA World Cup on Wednesday with a comfortable 3-0 victory over Suriname.
Mexico, Jamaica and Honduras are all still alive with a game to go in Group 2, while El Salvador booked their passage and T&T are nearly there.
While Costa Rica and the USA cool their jets with passage assured, Mexico face a tricky qualifying test in the Great White North in midweek.
Costa Rica became the first team to advance to next year's final CONCACAF qualifying 'hexagonal' by defeating host Suriname 4-1 on Saturday.