user: Question: Who was the opponent before week 5 that played on September 23, 2001?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 9, 2001', 'Tampa Bay Buccaneers', 'L 10–6', '61,521']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Week" < 5.0 AND "Date" = 'September 23, 2001';