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_24887326_7 (tie_no VARCHAR, away_team VARCHAR)

### Question ###
When the away team is Millwall, what is the total possible amount of tie numbers?

### Accurate SQL ###

SELECT COUNT(tie_no) FROM table_24887326_7 WHERE away_team = "Millwall"