His Essex signing continues a trend in which English counties have recruited New Zealanders in droves.
The friendly competitiveness with which last year's touring team played has created a mindset that a New Zealand presence might deliver such spirit into a county's ranks.
Brendon McCullum's team was revered by players, administrators, media and fans. A relatively docile Ashes series had pundits querying why New Zealand was only allotted two tests. The 1-1 result was their seventh consecutive undefeated series. New Zealand lost at Lord's but won at Headingley, their first test victory on English soil in 16 years. They lost the ODIs 3-2 and solitary T20I.
The Black Caps are perfect targets this year, with no international cricket scheduled between April and mid-July.
After that, they are pencilled in to play from late July to April against Zimbabwe (away), South Africa (home and away), India (away), Bangladesh (home), Pakistan (home) and Australia (away).
NZC's decision indicates Milne is unlikely to be required for test duty in Africa.
Ten current or former Black Caps are signed in various formats across the English season.
They include Matt Henry and Mitchell Santner (Worcestershire), McCullum and Mitchell McClenaghan (Middlesex), Hamish Rutherford (Derbyshire), Ryder (Essex), Ross Taylor (Sussex), Neil Wagner (Lancashire) and Kane Williamson (Yorkshire).
Luke Ronchi is also understood to be in discussions with a county. He played for Somerset last season.
McCullum (Rajkot), McClenaghan and Corey Anderson (Mumbai), Williamson and Trent Boult (Hyderabad) have IPL deals.
Martin Guptill, Colin Munro and Tim Southee are among those understood to be seeking contracts at the auction on February 6.