Tim Southee, a pace bowler for the New Zealand national cricket team, has hinted that other players may leave their contracts with the NZC Central.

The array of T20 leagues, including the cash-rich IPL, has fundamentally
changed the landscape of cricket, with more and more players ready to
forsake their national contracts in the enticement of lucrative
international deals, says New Zealand pacer Tim Southee.
Trent Boult, Martin Guptill, and Jimmy Neesham are the three New Zealand
players who have opted out of their central contracts to play in overseas
leagues.