CREATE TABLE table_name_63 (transfer_window VARCHAR(255), name VARCHAR(255), transfer_fee VARCHAR(255), moving_to VARCHAR(255))
What is the transfer window with n/a as the Transfer fee, free agent for the Moving to, and Joe Sagar as the name?
    
SQL: SELECT transfer_window FROM table_name_63 WHERE transfer_fee = "n/a" AND moving_to = "free agent" AND name = "joe sagar"