Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_21647 ( "Team" text, "Head coach" text, "Team captain" text, "Venue" text, "Capacity" real, "Kitmaker" text, "Shirt sponsor" text, "Club Chairman" text )

### Question ###
Who is the club chairman of the team that Murat Erdo an is the captain of?

### Accurate SQL ###

SELECT "Club Chairman" FROM table_21647 WHERE "Team captain" = 'Murat Erdoğan'