No. He could have signed one already for all we know. He is free to sign a pre-contract whenever he wants as soon as he has only 6 months left on his current contract?If he (or any other player) were to sign a pre-contract for the following season in this window,does it have to be announced before this window shuts?
However, a player like Messi, signing a deal to stay or to leave would have leaks.