The deal for the striker costs €14million plus Marcos Alonso included.
Both clubs are now finalizing details.
Once all details are resolved, the Gabonese is expected to fly to London in the next few hours.
Chelsea and Barcelona had since been locked in negotiations for the player, with the Spanish club also interested in Left-back, Marcos Alonso.
Barcelona ideally wanted both players to be handled in separate deals but Chelsea always insisted in a player plus cash deal for Aubameyang.
Both clubs will now finally get the players they had always wanted with everybody a winner.