UEFA is set to introduce changes to the Champions League so only the winners of the highest-ranked leagues and the title holder will be among the top-seeded teams.
UEFA general secretary Gianni Infantino confirmed in London that the group-stage change from next season only has to be "ratified" in December on by the executive committee.
Currently, UEFA ranks clubs over five years of results, leaving national champions Manchester City, Juventus and Paris Saint-Germain among No. 2-seeded teams this season.
Arsenal and FC Porto, who placed fourth and third in their respective leagues last season, were included in Pot 1.
Infantino said at the Leaders sports summit that "people had difficulties in understanding how the champion of a country is in a lower pot than the third ranked in that country."