When the playmaker departed Anfield in January 2018, Liverpool inserted a number of add-ons which could be activated at a later date.
At one stage this summer, it appeared that the Premier League champions would miss out on a portion of that deal as the Brazil international was frequently linked with a transfer elsewhere.
However, according to The Mirror, Liverpool are now likely to receive another £4.4m from the Spanish giants later this season.
The 28-year-old is said to be just 14 appearances away from reaching a set number of games, potentially in time for the January transfer window.
Coutinho was part of the starting lineup as Barcelona defeated Villarreal by a 4-0 scoreline in their opening encounter of the campaign.