Anfield officials rejected all offers for the Brazil worldwide, who submitted a transfer request in attempts to force a proposed transfer to the Nou Camp.
LIVERPOOL look set for another transfer window of speculation surrounding Philippe Coutinho after Barcelona publicly confirmed they are ready to revive their interest in the player in January.
The report says Klopp and the Anfield board accepted in return that they would have to listen to offers in January if Barcelona came back to the table.
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Liverpool's problems could be made worse if they fail to make it out of the group stages in Europe before Christmas - and also if their Premier League challenge falters any further.
'We are ready to buy Coutinho in the winter market, or any player the technical staff request, ' Grau said.
Barcelona might struggle to raise the winter funds it would require to tempt Liverpool into selling such a key figure halfway through the season, although claims of a "promise" between them and Coutinho would seek to unsettle any harmony.
Barca were thwarted in their attempt to prise Coutinho away from Anfield during the summer, with Liverpool placing a reported €200 million (S$321 million) asking price on the forward.