Table schema:
CREATE TABLE table_name_63 (transfer_window VARCHAR, name VARCHAR, transfer_fee VARCHAR, moving_to VARCHAR)

Question: 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"