Egypt had a worse fall. Mohamed Salah's Egypt dropped from 45th to 65th.
The Pharaohs failed to win a game in the World Cup, falling 3-1 to Saudi Arabia in the last match.
Egypt's fall is the biggest drop down is the biggest drop by any football team in the history of rankings.
Six African countries are ranked ahead of Nigeria in the new ranking.
Tunisia is world's number 24, and Africa's No.1. They are followed by Senegal, Congo Dr, Ghana, Morocco and Cameroon.
The new ranking formula, which was approved by the FIFA Council in June after a lengthy period of testing, relies on adding/subtracting points won or lost for a game to/from the previous point totals rather than averaging game points over a given time period as in the previous version of the Ranking.
The changes, of which there are several, include the fact that inactive teams now preserve their point totals, with no devaluation of older games. Points are dropped, however, from losing or drawing against weaker opposition, with the only exception to this rule matches in knockout rounds of major competitions such as the FIFA World Cup™.
The most important thing about the new method is, of course, the table it yields, and in that respect August's Ranking makes for spectacular reading:
France (1st, up 6) provide the headline news, as they have reclaimed pole position for the first time in over 16 years, returning to a spot they last held in May 2002. Just three points, however, separate Les Bleus from Russia 2018 semi-finalists Belgium (2nd, up 1), while World Cup runners-up Croatia (4th, up 16) have equalled their record Ranking position, last reached in June 2013. Other big movers include Uruguay (5th, up 9), England (6th, up 6), Sweden (13th, up 11), and World Cup hosts Russia (49th, up 21).
Naturally, there are losses as well as gains, with previous leaders Germany (15th, down 14) among several sides to suffer for group-stage elimination in Russia. Poland (18th, down 10), Peru (20th, down 9) and Costa Rica and Iceland (joint-32nd, down 9 and 10 respectively) also slipped down the table on the back of disappointing World Cup campaigns.