Former New Zealand Skipper Kane Williamson is doubtful for the three-match Test series between India and New Zealand, which is set to start on October 16. The Kiwis will travel to India to take part in a three-match series. The series opener is scheduled to take place at M. Chinnaswamy Stadium in Bengaluru, whereas the next two matches will be played in Pune (October 24-28) and Mumbai (November 1-5) respectively.