The West Indies, who won the title as recently as 2016, failed to qualify from the group stage after losing to Scotland and Ireland.
“I’ve given the captaincy a great deal of thought since the colossal disappointment of the T20 World Cup,” said Pooran, who gave up the captaincy of the international team for one day.
“I have taken on this role with great pride and dedication and have given absolutely everything for it over the past year.
“The T20 World Cup is something that should not define us and I will readily participate in the upcoming reviews.
“While it will take several months for us to come together again as a team, I want to give CWI plenty of time to prepare for the matches against South Africa in March and beyond.”
This tour, which includes two Tests, three ODIs and three T20s, is the next time the West Indies white ball squad will take to the field.
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The 27-year-old Trinidadian wicket-keeper, who has yet to play a Test, said his aim was to focus better as a player by removing the captain’s mantle.
“This is not me giving up,” Boran said. “I remain ambitious and it would still be an honor to captain the West Indies cricket team. There is no doubt that I remain fully committed to West Indies cricket and I look forward to offering my services as a senior player in a supporting role.
“By stepping down now as captain of the West Indies white ball I think it is in the best interest of the team and for me personally, as I need to focus on what I can bring to the side as a player.”
Boran have topped the West Indies in 2021 and this year in the absence of Kieron Pollard, the T20I series beat Australia 4-1.
He was officially named whiteball captain in May when Pollard stepped down.
In all, Pooran has captained the team in 17 ODIs and 23 T20s, with series wins over Bangladesh and the Netherlands.
Left-handed’s only white-ball century came against Sri Lanka in the 2019 ODI World Cup.
“I desperately want us to be successful, and the greatest value I can give the team is by fully focusing on the role of consistently scoring goals at crucial times,” Poran said.
Jamie Adams, CWI’s Director of Cricket, praised Pooran’s efforts as captain.
Adams said, “I know he remains fully committed to West Indies cricket. I am convinced he has a huge part to play in our future.”