The winger is linked to a move away from the Nou Camp after he struggled to settle after his £ 97 million move Borussia Dortmund last summer.
He was not even mentioned on the bench for the 4-3 home defeat of Sunday by Real Betis after not reporting for training.
This led to reports that suggested he would leave and that Premier League giants Chelsea and Liverpool would both be interested if he were available.
Dembele is currently participating in the French national team and is preparing to face the Netherlands in the UEFA Nations League on Friday and then in a friendly match next Tuesday in Uruguay.
And his agent, Moussa Sissoko, says his client is left sitting and claims that Barca manager Ernesto Valverde liked to keep him, despite the recent controversies.
"There is no doubt about his future," he said.
"Ousmane continues to work, he is in a big club and Valverde loves him, and he is also in the national team and (Didier) Deschamps continues to trust him.
"If he is in France today, it's because he deserves it, I also spoke with Eric Abidal, director of Barcelona and he told me that he is very happy with him, that he trains very well."
Dembele has been accused of having a posture problem after he reportedly came too late for the recent Champions League clash with Inter Milan.
Since then, however, it appeared that the deadline had been extended and that he had actually arrived on time.
And Sissoko thinks that the criticism of the 21-year-old is exaggerated.
"All these reviews make me laugh," he added.
"It had already started with a so-called delay at the meeting for the Champions League game against Inter.
"I am surprised that very serious newspapers can take this information back, because Ousmane did not arrive late.
"His coach confirmed that the fact that he was not in the starting XI was not due to a delay."
When he missed the training, he added: "It is true that Ousmane was ill (before Betis).
"He had not slept all night, he was very tired.
"He missed the morning training and what the club blamed us for is that he did not warn a little before a doctor can see his mismanagement at home.
He did it a bit late.
"But he was sick, the club confirmed that he had a (gastrointestinal disease), so he missed the training.
"And I am surprised that we also make controversy when he is ill."