CREATE TABLE table_73076 ("Round" TEXT, "Clubs remaining" FLOAT, "Clubs involved" FLOAT, "Winners from previous round" TEXT, "New entries this round" TEXT, "Leagues entering this round" TEXT)

Name the least clubs involved for leagues being none for semi finals
SELECT MIN("Clubs involved") FROM table_73076 WHERE "Leagues entering this round" = 'none' AND "Round" = 'Semi finals'
SELECT MIN("Clubs involved") FROM "table_73076" WHERE "Leagues entering this round" = 'none' AND "Round" = 'Semi finals'