It is a huge boost for interested club like Chelsea as they can now approach him with a deal starting from Thursday.
Dembele was also left out of the squad for the match against Athletic Bilbao.
It is a drastic change at the club as Barca coach Xavi Hernandez was confident the 23-year old will sign a new contract before the expiration of the current. It looks like a betrayal for Barcelona, who had held on to the winger despite his injury woes since his arrival from Borussia Dortmund.
Alemany, who was in charge of contract negotiations with the player and his representatives, sent a strong message.
He said: “It’s clear that Dembele does not want to continue with Barcelona. He doesn’t want to be part of our project.
“We told Dembele he has to leave immediately. We expect Ousmane to be sold before January 31.”
There are no shortage of interests for him as the most likely destination would be a reunion with former boss Thomas Tuchel at Chelsea but he could also rejoin former teammate Lionel Messi at Paris Saint-Germain especially with Kylian Mbappe's departure imminent.
He could also return to Germany but with Bayern Munich.
For now, the negotiations with Barcelona have come to an end.