That's according to Bundesliga expert Lee Price who says Dembele is the man heading to the Nou Camp this summer.
Barca are interested in both players, but can't afford to sign the duo this summer despite selling Neymar.
The Brazilian joined Paris St-Germain for £198m last week in a deal that rocked world football.
But a combined fee to sign Coutinho and Dembele would surpass that figure.
And Price thinks Liverpool will hold on to their star man for another 12 months.
He told The Express: “Dortmund have agreed to sell Ousmane Dembele to Barcelona, it'll happen.
"It's just the fee that needs to be finalised.
“The German club are holding out for as much as they can possibly get - and more than £90m would be an incredible result for a player that cost them a tenth of that a year ago - which could scupper Barca's interest in Philippe Coutinho.
“In any case, even with the sale of Neymar, the Catalans couldn't afford both Dembele and Coutinho.
"They would've needed to find extra financing.
“Now, once Dembele joins, there's going to be less money and, crucially, less inclination for Coutinho.
“That will lend itself well to Liverpool's hopes of convincing him to stay another year.”
