While NZC appointed Herath as the spin bowling coach for one Test against Afghanistan and two against Sri Lanka, respectively, Rathour will be part of their coaching staff for a one-off Afghanistan Test starting September 9 in Greater Noida. New Zealand head coach Gary Stead said both men are regarded highly in world cricket for their contributions on and off the field. Considering NZ has three left-arm orthodox spinners, Ajaz Patel, Rachin Ravindra and Mitchell Santner, in their squad, Herath's inputs will benefit them all. "Both men are held in high regard in the world of cricket, and I know our players are really looking forward to the opportunity to learn from them," New Zealand coach Gary Stead said. "For our three left-arm orthodox spinners in particular, Ajaz [Patel], Mitch [Santner] and Rachin [Ravindra], having the chance to work with Rangana across three Tests on the subcontinent will be hugely beneficial. "Rangana has taken over 100 Test wickets in Galle, which is the venue of our two Tests against Sri Lanka, and so his knowledge of that venue will be priceless," Stead continued.   With New Zealand set to play six Tests in Asia, including one against Afghanistan (which is not part of the WTC cycle), two versus Sri Lanka and three against India (in Bengaluru, Pune and Mumbai, respectively), they will bank on their spin department to win matches in sub-continent. Apart from the three left-arm spinners, NZ also has Glenn Phillips and Michael Bracewell in the side for the AFG and SL Tests. New Zealand is yet to announce the Test squad for the India series. Two big names included Herath, a former Sri Lankan great, picked 433 Test wickets during his almost two-decade-long cricket career and was part of Bangladesh's backroom staff until recently. He has replaced former Pakistan spin king Saqlain Mushtaq, who is now among the five-member unit the PCB named to uplift their domestic cricket. Rathour, who also played six Tests for India, was part of Rahul Dravid-led backroom staff, working as the batting coach. Before his tenure ended in June earlier this year, he guided Team India to its second T20 World Cup title in the Americas.