Barcelona is reported to have increased its bid for Coutinho to 90 million pounds (US$115 million) this week after two previous offers were rejected by the English Premier League side.
Should Dembele's move go through it would see Dortmund make a huge profit on a player who has only played 32 games for the club. We do not know why.
As the Spanish club look to replace Neymar, who joined PSG last week for a world record £199m, they have been informed by Dortmund of the staggering fee it would take to release Dembele from his contract.
Reports earlier on Thursday had claimed that Dembele's move to LaLiga was "imminent" after he failed to report for training, with Dortmund manager Peter Bosz admitting the club had no idea where he was.
Dembele was a no-show for training as Dortmund prepared for their DFB-Pokal first-round encounter with minnows Rielasingen-Arlen, and news of Barcelona's firm interest may explain his rebellion.
Unimpressed, Dortmund promptly suspended the Frenchman for his unexplained absence.
It is also believed that Dortmund have slapped a €150m price tag on Dembele, but Barca are looking to chop off €30 million from it before agreeing on a deal.
But Liverpool manager Klopp remains adamant the 25-year-old will stay at Anfield no matter what Barca are prepared to pay.