Coutinho is already amongst the goals during his loan with Villa, where the deal does not carry a formal permanent option.
Sport says the outline of a deal worth €40m was raised during negotiations.
However, with Coutinho's Barca contract now inside it's final 18 months, there's an understanding between the two clubs that a fee in the region of €25m will be more realistic.
Since his Villa debut, the midfielder has scored 2 goals and provided 2 assists in the space of three games.
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