Peter Bosz admits he does not know where the player is and that BVB have been unable to reach him.
Reds turned down a £90m offer from Barcelona for Coutinho on 9 August.
IBTimes UK had earlier revealed Bale had no intention of leaving Real.
Woodburn is highly regarded by Reds hierarchy while Moreno has become a whipping boy.
Bale, 28, is under pressure to deliver at the Santiago Bernabeu after an injury-hit 2016/17 season.
Barcelona are looking to use the funds generated by Neymar's sale on Dembele and Coutinho.
Reports from Spain suggest former Turkish international has offered to rejoin Los Colchoneros.
Roberto is set to be deployed in his preferred midfield after two seasons at right-back.
Sport says that the deal could be completed in a matter of hours for around €90m plus add-ons.
Argentine satisfied with the current strength of his squad ahead of 2017-18 La Liga campaign.
Philippe Coutinho, Ousmane Dembele and Inigo Martinez are said to be the Catalan's main targets.
The Spain international is close to swapping Real Sociedad for the Nou Camp.
Reports from Spain suggest that Chelsea have also entered race for versatile Spanish international.
Liverpool manager Jurgen Klopp was believed to be against the sale of Coutinho.
Real have assured Bale that he is the future of the club, according to reports.
Real Madrid are also believed to be interested in Dortmund's Dembele.
France international expected to leave the Ligue 1 champions in deal worth £161m.
Neymar completed a move to PSG and signed a 5-year deal at Parc des Princes.
Neymar's representatives deposited the payment at La Liga headquarters - but it has been turned down.
Catalan giants have already held talks with Mbappe's representatives, according to reports.
Barcelona have confirmed Neymar has asked to leave the club this summer.
Martinez is the third choice keeper at Arsenal behind Petr Cech and David Ospina.