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_13724 ( "Week" real, "Date" text, "Opponent" text, "Result" text, "Attendance" real )

### Question ###
What's the week when the Green Bay Packers were the opponent and less than 57,966 were in attendance?

### Accurate SQL ###

SELECT COUNT("Week") FROM table_13724 WHERE "Attendance" < '57,966' AND "Opponent" = 'green bay packers'