The Catalan club turned to the 26-year-old late in the window after seeing three bids for Liverpool playmaker Philippe Coutinho knocked back.
A transfer could not be agreed between the two sides, however, leading to Seri hitting out at Nice chiefs for denying him his dream move to Camp Nou.
It later emerged that Barcelona were to blame for the botched deal, though, having initially agreed to buy the Ivory Coast international for £36.8m.
According to Spanish outlet Sport, Barcelona will get their man when the transfer window reopens in January after a new agreement was reached.
Seri has featured three times for Nice in Ligue 1 this season, claiming one assist so far.