England have been drawn in the same group as rivals Australia for the T20 World Cup, while India have been placed in a pool with Pakistan.
The Super 12 stage of the 16-team limited-overs tournament will see England, Australia, South Africa and West Indies do battle in Group 1, along with two qualifying teams.
Group 2 will contain India and Pakistan, along with New Zealand, Afghanistan and an additional two qualifiers.
Eight teams are involved in round one of the tournament and will vie to fill those final four places in the Super 12.
Sri Lanka, Ireland, Netherlands and Namibia are in Group A, while Bangladesh, Scotland, Oman and Papa New Guinea make up Group B, with two from each pool to progress and join the highest-ranked nations.
A short round one stage will include 12 matches, starting on October 17 and the top two from each group progressing.
The winners of Group A joining the group involving England and Australia along with the runners-up of Group B. Bangladesh are favourites to win Group B - if they do, they will join the competitive group containing India along with the side who finishes second in Group A.
The Super 12 stage is scheduled to start a week later from October 24 and will consist of 30 matches, making up the bulk of the tournament.
Only four teams will emerge to contest the semi-finals, with the final then to be held on November 14.
It was confirmed last month by the ICC that the T20 World Cup will now be held in the United Arab Emirates and Oman rather than India this year.
Australia was originally scheduled to host the 2020 tournament ahead of India staging it this year.
However, the pandemic forced the ICC to postpone last year's tournament, giving Australia hosting rights for 2022.
A second surge in cases of coronavirus in India then forced a major change to the 2021 competition, which will still be hosted by the Board of Control for Cricket in India (BCCI).
West Indies are the defending champions after defeating England in the final the last time this tournament was held back in 2016.
England and India are rated as the leading contenders to come out on top, ranked one and two in the world respectively by the ICC in the format.