CREATE TABLE table_name_99 (opponent VARCHAR, week VARCHAR, date VARCHAR)

Who was the opponent before week 5 that played on September 23, 2001?
SELECT opponent FROM table_name_99 WHERE week < 5 AND date = "september 23, 2001"
SELECT "opponent" FROM "table_name_99" WHERE "date" = "september 23, 2001" AND "week" < 5