"We've worked closely with the Blues to have Caleb released to train with us and he is part of our plan to build depth heading into the Commonwealth Games - he's a big, powerful winger," Sevens boss Clark Laidlaw said.
"We're excited about having Luke back in our environment, he's been working hard for the past year and has ticked all the boxes we've asked of him.
"It's an opportunity for these players and it's the start of us building depth."
Laidlaw said he was confident for the first Sevens event of 2018, and impressed by his troops' fitness levels after their Christmas break.
They are currently first in the Sevens World Series standings after two events, and will face Russia, Samoa and Fiji in their pool in Sydney.
ALL BLACKS SEVENS: Kurt Baker, Caleb Clarke, Scott Curry, Sam Dickson, Andrew Knewstubb, Vilimoni Koroi, Luke Masirewa, Tim Mikkelson, Sione Molia, Joe Ravouvou, Teddy Stanaway, Regan Ware, Joe Webber.
- NZN