"This deal was pretty close to being completed before Christmas, it's just it takes a little while to work through all the details. [TVNZ] was not something that figured into our thinking," said Last.
"We have just been concentrating on our own game. If we get our game right, we will have done the right thing by subscribers.
"We think these events are of major interest to sports subscribers and we think we can make it work."
Given the massive shift in viewership habits over the past few years, investing in a deal of this length could be seen as a risky strategy. But Last believes the Olympics will always be a safe bet.
"Although eight years sounds like a long time, in terms of television rights I don't think it is that long. People are always going to want to watch the best athletes perform on the big stage and I think we have a great platform to allow that to happen."
"Rumours of [television's] impending demise is probably a little bit exaggerated. And the data in the States shows that - there was lots of talk about cord-cutting and going without a cable subscription, but I think they have risen again for the first time in a couple of years."
IOC President Thomas Bach said the organisation's long-term partnership with Sky is "another clear demonstration of the enduring appeal of the Olympic Games".