"I know the guys who were involved with Graham Henry in 2001 - he lost half the team on day one because he went 'you guys over here, and you guys over there' and the players knew straight away, 'well, that's the test side and we're just making up the numbers'.
"I think it's important that these guys are putting themselves in the shop window, that they've got a chance to prove themselves and with a little bit of luck they're in contention for the test."
Interestingly, Gatland said he had informed his players of the match-day squad for the first game of the tour a week ago, and was surprised all had managed to keep it a secret.
It is made up mainly of players who haven't had club final commitments, and had trained together at a recent camp in Dublin.
While the Lions arrived only three days out from the first game, they will have been together for longer than their Provincial Barbarian opponents, a side picked from the second-tier talent in New Zealand who travelled to Whangarei on Sunday.