CREATE TABLE table_31118 ("Team" TEXT, "Chairman" TEXT, "Head Coach" TEXT, "Captain" TEXT, "Kitmaker" TEXT, "Shirt sponsor" TEXT)

Name the chairman for iker casillas
SELECT "Chairman" FROM table_31118 WHERE "Captain" = 'Iker Casillas'
SELECT "Chairman" FROM "table_31118" WHERE "Captain" = 'Iker Casillas'