Window only applies to registrations. Pogba could still be sold technically, but obv w/o a replacement, won't happen. Like wise, we could sign SMS on 17th, and sell Pjanic to a league that has a later window close on the 28th. I do however, we sign any players with the expectation that we will sell a player. If we sell any player later than the 18th, it was probably because we were planning already to sell them, but were waiting for the right offer.