CREATE TABLE table_55287 ("Name" CLOB, "Country" CLOB, "Status" CLOB, "Moving to" CLOB, "Transfer window" CLOB, "Transfer fee" CLOB)

What country is the player, with an undisclosed transfer fee and moving to Nacional, from?
SELECT "Country" FROM table_55287 WHERE "Transfer fee" = 'undisclosed' AND "Moving to" = 'nacional'
SELECT "Country" FROM "table_55287" WHERE "Moving to" = 'nacional' AND "Transfer fee" = 'undisclosed'