If we do manage to sign a big player this week, I hope that we won't be announcing it anytime soon. The reason being that we are currently dealing with rivals in the Champions League and they may have ambitions of winning the title (even if it's not realistic ambitions, we have no right to judge them on their own goals).
For example, if Liverpool know that we already have Dembele, then they may be even more reluctant to sell Coutinho out of fear of making us too strong. The same goes for Juve and all other teams we are currently trying to strike a deal with.
Regardless of what the fans want, the directors need to be smart about how they manage the situation. We need to keep the cards close to our chest. It's a tricky situation but the least we can do now, is not shoot ourselves in the foot by being morons.
It is difficult to keep big transfers a secret these days but we must find a way. Pay the selling club a little extra if it means that they will agree to not make the deal official until Barcelona announces it.
This is assuming that we sign anyone at all. Perhaps Barto is keeping Paulinho a secret because he doesn't want others knowing yet