Liverpool held off advances from the Catalan giants in the summer, rejecting up to £118m for Coutinho.
But Barcelona chief executive has said: "We are ready to buy Coutinho in the winter market, or any player the technical staff request.
“But it is important to adjust ourselves, so if there are to be arrivals, there must be exits as well.”
Liverpool maintain, though, that the Brazilian playmaker is not for sale at any price and he won't go this season.
Starsport understands the Reds are far from impressed by Barcelona's latest public pursuit of the 25-year-old.
Jurgen Klopp's former mentor at Mainz, Eckhard Krautzun, has revealed the Liverpool boss always dreamt of taking charge at Manchester United.
The two side go head-to-head at Anfield on Saturday, and Krautzun has told The Set Pieces: “It would be his dream to go to England one day and his favourite club would be [Manchester] United. That’s what he said."