Juve are now in advanced talks to sign Kostic, who is out of Eintracht's squad for the UEFA Super Cup clash with Real Madrid in Helsinski.
Eintracht sporting director Markus Krösche confirmed: “Filip performed in an exemplary manner last season and played an important role in winning the UEFA Europa League. We have always said that we were not going to put any obstacles if we received an offer that was good for all parties and that we were willing to talk.
"We are currently in promising talks with another club and a solution is emerging.
“We have a large squad and we trust the boys a lot, they all deserve their chance and are excited about the challenges that lie ahead. In this context, we decided, also at the request of the possible new club, to play the match against Real Madrid without Filip."