CREATE TABLE table_49706 ("Exit Date" TEXT, "Pos." TEXT, "Player" TEXT, "To club" TEXT, "Transfer fee" TEXT)

Who had a transfer fee of released and played the position of DF?
SELECT "Player" FROM table_49706 WHERE "Transfer fee" = 'released' AND "Pos." = 'df'
SELECT "Player" FROM "table_49706" WHERE "Pos." = 'df' AND "Transfer fee" = 'released'