Juventus continue negotiations with Eintracht Frankfurt and hope to get Filip Kostic before the European Super Cup on Wednesday.
The Bundesliga club have set the price-tag at €15m and so far the offer had been €11m plus bonuses.
Sky Sport Italia and Sportitalia both claim talks continued in a positive mood today and the gap between their positions has closed.
Both sides are confident they can do a deal before Eintracht Frankfurt play against Real Madrid in the European Super Cup on Wednesday evening.
His agent and intermediary Alessandro Lucci is a key figure in the talks and working constantly to reach an agreement, as Kostic has told West Ham United he is not interested in their proposal, focusing only on Juventus.
The 29-year-old Serbia international has already made two official appearances for the club this season in the Bundesliga and DFB Cup.
His contract with Eintracht Frankfurt only runs to June 2023.