so they have 13 days to srot out their finances and sell players or they cant register Messi or the others they have brought in...Kun, Garcia, Depay...
They have a lot to do....I cant see Messi hanging around for a few months and just training. (Im presuming the next time they culd register him and other others would be the Winter transfer window)
Not sure it is a real deadline. A self set one to publicly push players' buttons.