"In the next hours we will inform you of the details of the player's arrival and presentation", the Spanish club said in a statement.
Philippe Coutinho is joining Barcelona after Liverpool agreed to sell the Brazilian in a deal that makes him the second-most expensive player in soccer history.
"The player now has permission to complete the usual formalities to conclude the transfer immediately".
Coutinho's name briefly appeared on a Nike advert for Barcelona shirts last week before being removed. "It is his dream and I am now convinced there is nothing left at our disposal to change his mind".
It's odd timing for the move as Coutinho can not play for Barcelona in the Champions League this season, having participated in the cup with Liverpool.
While the latest offer from Barcelona could well have swayed the reluctant Reds, it seems Coutinho's own insistence at leaving Anfield was also a decisive factor.
The final deal will be eclipsed only by the £200m Paris St-Germain paid Barcelona for Neymar last summer, and the £165.7m Kylian Mbappe will cost PSG at the end of his initial loan spell from Monaco.
Coutinho, who joined Liverpool from Inter in January 2013, was the subject of significant interest from Barca in the previous transfer window, but a switch to Camp Nou failed to materialise as Liverpool rejected multiple bids and the playmaker's transfer request.
Coutinho will not be able to play for Barcelona in the Champions League since he has already featured in the competition with Liverpool in the group stage.