CREATE TABLE table_49988 ("Exit Date" CLOB, "Pos." CLOB, "Player" CLOB, "To club" CLOB, "Transfer fee" CLOB)

What club received a DF player for free?
SELECT "To club" FROM table_49988 WHERE "Transfer fee" = 'free' AND "Pos." = 'df'
SELECT "To club" FROM "table_49988" WHERE "Pos." = 'df' AND "Transfer fee" = 'free'