Martin O'Neill has overseen a continual decline with the Boys in Green falling down the ranking for the third consecutive monthRepublic of Ireland have dropped four places in the newly updated Fifa ranking, released on Thursday, and now find themselves at a record low of 70th.
The fall sees a continuation of a gradual descent in the table, with Martin O'Neill's team dropping places for the third consecutive month.
A home defeat against Turkey and scoreless draw against Italy were taken into account and O'Neill's team have now been overtaken by their Euro 2016 qualification rivals Poland, as well as El Salvador and Albania.
Northern Ireland have fallen six places following their defeat against Uruguay and Michael O'Neill's team now occupy 90th place in the ranking table.
The top two remain unchanged, with Spain in first position and Germany ranked second. World Cup hosts Brazil have moved into third ahead of the competition, replacing Portugal, who drop one place to fourth.
England, meanwhile, have broken into the top 10 following their victory over Peru. Ireland's Euro 2016 qualification rivals Scotland have dropped five places to 27th, while Wales have moved up six place to 41st.