Ross Taylor had earlier said he would have retired had New Zealand lifted the 50-over World Cup against England in 2019.
The five-match test series between England and India starting August 4 will kick off the second cycle of the World Test Championship.
Williamson said India might not have managed to win the World Test Championship final but that is not a reflection of the quality of the Asian giants.
New Zealand captain Kane Williamson says the pain of losing two ICC World Cup Finals in the past makes their win at Southampton even more special.
A fascinating WTC Final saw both teams play an extremely high standard of cricket for long stretches, with the two bowling attacks particularly impressive.
Kane Williamson's New Zealand finally etched their name in history as they won the ICC World Test Championship final against India.
New Zealand overcame 21 years of pain to finally win an ICC event as they secured a brilliant win against India to clinch the ICC World Test Championship.
The Kiwis made full use of the slender 32-run lead and the Williamson-led side made it easier to a target of 139.
New Zealand chased down the target of 139 on the reserve day after bowling India out for 170 in their 2nd innings to win the inaugural ICC World Test Championship in Southampton on...
Tim Southee became only the second New Zealander ever to take 600 international wickets and claims it's because he is always looking to add to his game.