Giovanni Trapattoni's team have fallen two places in the Fifa ranking table after managing to hold on to their position for two consecutive months
The Boys in Green won their previous two games in September against Kazakhstan and Oman, but have nevertheless fallen two places. It is Ireland's first fall in the rankings in two months, after Trapattoni's team managed to maintain their place in September and August.
Spain remain at the top of the ranking table, with Ireland's World Cup qualifying rivals Germany holding on to second spot. Roy Hodgson's England have fallen out of the top three, dropping two places to fifth position.
Portugal have risen to third position and Argentina have also improved their place, rising three to occupy fourth in the updated ranking table, while Sweden have dropped three places to 21. Colombia are the month's big winners, rocketing up to ninth; their highest position for a decade.
Northern Ireland, meanwhile, have risen by 12 places to 117 having previously dropped to their lowest-ever ranking. Scotland have dropped nine places to 56, while Wales now occupy 57, having fallen 12 places.