CREATE TABLE table_22297198_3 (replaced_by VARCHAR, date_of_vacancy VARCHAR)

Who was the replacement manager for the vacancy of 12 Dec 2009?
SELECT replaced_by FROM table_22297198_3 WHERE date_of_vacancy = "12 Dec 2009"
SELECT "replaced_by" FROM "table_22297198_3" WHERE "12 Dec 2009" = "date_of_vacancy"