"Our first step was to gauge individual player interest, and then All Blacks Sevens management presented to those players before a firm commitment was sought.
"The four players selected have all previously played for the All Blacks Sevens which speaks volumes to the culture that (coach) Clark Laidlaw and his team have really built within that environment. It's been a key focus of the management to offer young players world class rugby experience so to have these four put their hand up to return is a great result."
Clarke, Nanai-Seturo and Rayasi will join the All Blacks Sevens squad after their Mitre 10 Cup commitments at the end of this year while Gregory will assemble with the Highlanders until March 2020.
"One of the biggest considerations in this process has been the team environment. We have a group of contracted players that have won the Commonwealth Games Gold and Rugby World Cup Sevens last year, so we're very mindful that those coming in need to complement that group," Anthony said.
Rayasi was a member of the World Cup winning All Blacks Sevens team in 2018 while Nanai-Seturo won Commonwealth Games gold with the team last April.
"We think we have the right mix of players that are coming in – size, speed and power, they will be a great addition to the All Blacks Sevens programme," Anthony added.
The Blues, Chiefs, Hurricanes, and Highlanders are free to recruit an additional player to their 2020 squads. The Crusaders are the only team to not have representation in the wider sevens squad.