Grau also reiterated that Lionel Messi has already signed a new long-term deal at the Nou Camp with the club just waiting for the right time to make if official.
While that is the case for now, it would be no surprise if a European heavyweight or two came sniffing again in the future, and if Coutinho does ultimately leave, Liverpool will need a replacement.
Barcelona have signalled their intentions to revive efforts to sign Liverpool's Philippe Coutino when the transfer window opens in January.
"We are ready to buy Coutinho in the winter market or any player the technical staff request", the Liverpool Echo quotes Grau as saying.
It's likely the Anfield club will be upset with Grau's comments having written to Barcelona urging them to stop trying to unsettle Coutinho.
During the same press conference, Grau revealed a record budget for the 2017-2018 campaign of €897m, as well as €708m in income for the 2016/17 season. We could [sign in January].
One player expected to leave in the New Year is Andre Gomes; the Portugal global was set to join Tottenham on transfer deadline day and Sportsmail understands that move will be resurrected in January. We will study it if it necessary.