CREATE TABLE table_21647 ("Team" CLOB, "Head coach" CLOB, "Team captain" CLOB, "Venue" CLOB, "Capacity" FLOAT, "Kitmaker" CLOB, "Shirt sponsor" CLOB, "Club Chairman" CLOB)

Who is the club chairman of the team that Murat Erdo an is the captain of?
SELECT "Club Chairman" FROM table_21647 WHERE "Team captain" = 'Murat Erdoğan'
SELECT "Club Chairman" FROM "table_21647" WHERE "Team captain" = 'Murat Erdoğan'