The talent on display at the Bunnings Super Rugby Aotearoa Under-20 tournament meant selectors had some tough decisions to make.
"The talent we saw in Taupō was outstanding," Matson said.
"We have a real range of players; for some guys this will be their first black jersey and the culmination of a lot of years of hard work, and then there are guys like Ruben Love, who has been starting at first five for the Hurricanes.
"There are also some who went close but have missed out, and I have no doubt will go on to be very good rugby players."
The Under-20 schedule for 2021 had yet to be confirmed, but Matson was hopeful of taking on Australia.
"The aim is twofold. I have a clear remit to develop professional rugby players, and our group of coaches need to provide a platform for these players to go to the next level, but also whenever you put on a black jersey there is expectation that you perform well, so we really want to do that," he said.
Selection for the Junior All Blacks is recognised as one of the premier pathways to Bunnings NPC, Super Rugby and All Blacks selection. Almost half of New Zealand's 2015 Rugby World Cup squad had played for the national under-20 side.
The team won the first four World Rugby Under-20 Championships from 2008-2011, before falling short in 2012, 2013 and 2014. They won again in 2015 and 2017, England taking out the 2016 event.
Globally more than 100 players who have featured in that competition have played test rugby, including more than 30 recent or current All Blacks.