According to Sport, the Brazillian international has agreed to move to the Le Parc des Princes.
Recall that Barcelona earlier offered the former Liverpool star alongside €100million to Paris Saint-Germain for Forward Neymar.
The La Liga champions are open to selling Coutinho this summer, but are demanding a transfer fee of at least £80million for the player.
Coutinho has failed to impress since arriving from Liverpool in a £105million deal in January 2018 despite playing his part in two La Liga title wins.
A disappointing performance against his former club at Anfield saw Barcelona crash out of Europe, raising more questions about the 26-year-old.
Coutinho has also drawn interests from Liverpool, Manchester United and Paris Saint-Germain in the past few weeks.
The former Liverpool star is currently at the 2019 Copa America in Brazil with his national team.