New Zealand captain Daniel Vettori and vice-captain Brendon McCullum will both miss the one-day international tri-series with Sri Lanka and India which starts in July.
Vettori is to stay at home for the birth of his second child, while McCullum, who is also expecting his second child, is being rested.
In their absence, Ross Taylor will captain the side and Kyle Mills will stand-in as vice captain in Sri Lanka.
"With Daniel not touring Sri Lanka, it provides an opportunity for Ross to further develop his captaincy skills. Ross was vice-captain for a portion of last season and did a great job leading New Zealand to victory against Australia in Napier earlier in the year when Daniel was injured," New Zealand coach Mark Greatbatch said.
Taylor said captaining New Zealand was a special moment in his career.
"While it will be a tough tour against quality opposition, it represents a good opportunity for players to experience sub-continent conditions, particularly with the World Cup on the horizon," the Central Districts batsman said.
McCullum has further announced he will no longer perform wicketkeeping duties in Test matches.
He will, however, make himself available for future one-day internationals - the aim being to prolong his career with the World Cup also scheduled for early next year.
Meanwhile, Wellington all-rounder Grant Elliot returns to the squad, as does Jesse Ryder after he sustained an elbow injury during the ICC World Twenty20 in the West Indies.
Promising teenager Kane Williamson embarks on his first overseas tour with the national side having been called into the Test squad for the Australian series earlier this year.
In Vettori's absence, there is also the chance for off-spinner Jeetan Patel to get some regular action.
However, fast bowler Ian Butler was not considered because of injury.
The series format sees New Zealand, India and Sri Lanka play each other twice, with the top two sides progressing to the final.
New Zealand squad to tour Sri Lanka: Ross Taylor (captain), Grant Elliot, Martin Guptill, Gareth Hopkins, Nathan McCullum, Andy McKay, Kyle Mills (vice-captain), Jacob Oram, Jeetan Patel, Jesse Ryder, Tim Southee, Scott Styris, Daryl Tuffey, B.J. Watling, Kane Williamson.