The move confirmed Williamson's status as McCullum's long-term successor, with chief selector Bruce Edgar saying it would give the 24-year-old valuable experience in charge for five ODIs and two T20I matches to be played in the UAE.
Edgar said McCullum, along with pacemen Tim Southee and Trent Boult, will return to New Zealand to prepare for the series against Sri Lanka, which begins on December 26.
“Managing the players' workloads will be an important part of our summer's plans and this is simply an example of that,” he said, stressing that the decision has nothing to do with the tragic death of Australian batsman Phillip Hughes as it was made before the incident. “On the flip side, it gives us a chance to assess and evaluate other players in contention for the World Cup squad, and allows us to work on some of our contingency plans, such as developing Kane's captaincy.”
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