"I know the news of my decision to decline a central contract today will be seen as me choosing money over representing my country," Neesham posted on an Instagram story. "I had planned to accept a contract offer in July, however since being left off the list I have committed to other leagues around the world. It was a difficult decision but I have decided to honour those commitments rather than go back on my word to re-sign with NZ Cricket.

"Playing for the [Blackcaps] has been the greatest honour of my career and I remain committed to taking the field with my countrymen for the foreseeable future, especially in pinnacle world events."

Neesham has his name in for the SA20 league, which has its auction on September 19.

"Finn clearly has huge talent and potential," New Zealand head coach Gary Stead said. "He's shown he's up to the international level in his limited opportunities to date. In particular, his match-winning 96 against West Indies on a difficult wicket in Barbados showed his class and maturity."

Tickner has played six ODIs and 11 T20Is, most recently against Netherlands, and was part of the initial touring squad for the Test series in England earlier this year.

"Blair's been in Blackcaps squads for all three formats over the past 12 months which is testament to his progress," Stead said. "He's a bowler who just keeps improving and we've been particularly impressed with his red-ball development, which saw him in the recent squads for the England and South Africa Tests. He knows the environment, understands his role, and bowls with good pace and aggression."

New Zealand will name their T20 World Cup squad on September 20. They will prepare for the tournament with a tri-series in Christchurch featuring Pakistan and Bangladesh from October 7 to 14. Their first match of the T20 World Cup is against hosts Australia at the SCG on October 22.