Injury and Super Rugby commitments have forced two changes to the New Zealand sevens squad for the next leg of the IRB sevens series.
The Wellington victors and series leaders will head to Las Vegas without playmaker Toby Arnold and All Black wing Hosea Gear.
Arnold tore his anterior cruciate ligament in New Zealand's defeat of Scotland in their first game in Wellington, while Gear returns to duty for the Highlanders ahead of their Super Rugby campaign.
They are replaced by Taranaki's Waisake Naholo and Waikato's Johnathan Malo in the 12-strong squad for the February 10-12 tournament where New Zealand are top seeds.
Naholo is one of the 15 players contracted for 2012 but Malo is not on contract.
New Zealand beat Fiji 24-7 to retain the Wellington title and now have 73 points in the series, three ahead of Fiji.
South Africa won the Las Vegas leg last year.
NZN