As per rumors, NaVi and Virtus Pro have both declined their invitations to the ESL Pro League Finals.
For now, VP and Na'Vi have both declined to attend the Pro League finals in Brazil. Look towards G2 or Hellrasiers to replace Fnatic.
— DeKay (@NWDeKay) October 24, 2016
This source has been on point in the past and it is up for debate how accurate this information is. One of the key points for this seem to be the difference in distance and time zone for the players.