Barca have spent an initial $A157 million on the France international, finally recruiting a replacement for Neymar after his world-record switch to Paris Saint-Germain.
And while the Catalan club IS delighted that a protracted transfer has gone through, so too are Rennes, Dembele's first club, which has now netted around $A60 million in transfer fees for the player.
However, a statement on the Rennes website insisted that its pride at the deal went beyond financial gain as it hopes its youth system will be given greater credit.
"When joining Barcelona, Ousmane Dembele also puts focus on the quality of Rennes' training," it read.
"Ousmane Dembele took advantage of the ability of the club to make every effort to bring him to his highest level.
"We are particularly proud of the sporting rise of Ousmane Dembele, to whom we sincerely wish the best possible success throughout the course of his career."
Dembele scored 12 Ligue 1 goals in 26 games in his sole senior season with Rennes.