Despite the decision, Williamson reiterated his dedication to the Blackcaps, committing to participate in eight World Test Championship matches in the coming months and the ICC Champions Trophy in Pakistan next year.
The 33-year-old also mentioned that he is open to the possibility of accepting a central contract in the future.
“Helping push the team forward across the formats is something I’m very passionate about and something I want to keep contributing towards,” Kane said
“However, pursuing an overseas opportunity during the New Zealand summer means I’m unable to accept a central contract offer.
“Playing for New Zealand is something I treasure, and my desire to give back to the team remains undiminished.
“My life outside cricket has changed however – spending more time with my family and enjoying experiences with them at home or abroad is something that’s even more important to me.”