Chief selector Nowroz Mangal on Tuesday announced squad first-ever bilateral series against West Indies scheduled to be played in June.
England rises to second but India and South Africa drop following annual T20I rankings update.
Australia remain on second, while India replace New Zealand on third position and Kiwis slip to fourth.
Afghanistan will embark on a limited-overs tour of the Caribbean for the first time in June of this year.
Afghanistan clinch a 3-2 one-day series win over Ireland as Rahmat Shah scores century helps secure a seven-wicket victory at Greater Noida.
Kevin defied a hamstring injury to steer Ireland to a three-wicket win over Afghanistan and square the five-match One-Day series at 2-2.