moguce da je...release notice...mada je to iz pravilnika koji se nekada koristio u USA...mozda pomogne ovo....
The reserve clause, contained in all standard player contracts, stated that, upon the contract's expiration the rights to the player were to be retained by the team to which he had been signed. Practically, this meant that although both the player's obligation to play for the team as well as the team's obligation to pay the player were terminated, the player was not free to enter into another contract with another team. The player was bound to either a) negotiate a new contract to play another year for the same team or b) ask to be released.

one more idiomatic option