Debutants Ireland, an associate team, beat Bangladesh by 74 runs in a Super Eights match between the tournament's two giant-killers on Sunday in Bridgetown
It was the second win over a test team for the World Cup debutants.
Ireland scored a shock win over 1992 winners Pakistan to knock them out in the first round and the win over Bangladesh was their first of the second-stage Super Eights.
According to ICC rules, an associate team will enter the main ranking list if they beat two test teams.
There are now 12 teams on the one-day international ranking list, the 10 test-playing nations plus 2003 semi-finalists Kenya and Ireland.
