A club cannot announce a signing until the cooling off period has finished though.
Which is why we went through page after page of Joel Thompson comments waiting for the club to announce his signing after the cooling off period which obviously didn’t eventuate.
I am certain that if the player and club wish to announce the signing they will ... a cooling off period is a legally enforceable law ... announcing it is just good/bad sense prior to the end of the 10 day period.