All of which means Kaino will have very little rugby behind him ahead of a test which has a special significance. Kaino was born in American Samoa but his family are all of Western Samoan heritage and he was looking forward to a return.
"It's a huge test to try to be available for," he said. "I don't think they'll ever have another one over there. It's one for the history books and I'd love to be involved.
"Match fitness is the big one," he said when asked about the biggest barrier to his availability. "I'm lucky I can still hop on a bike and do other things. And in a couple of weeks I'll probably be able to run. But it's the game fitness where you're taking the hits and knocks, that's the biggest concern for me because by the time I'm available we're right into the All Blacks' season. Apart from that test there isn't any other rugby where I can get match fit."
Kaino's only option would be a rare appearance or two for his University club.
The test in Apia on July 8 - a Wednesday - will be four days after the Super Rugby final. With the Blues out of the playoffs, a fit Kaino would have been a near certainty to start.
Liam Messam, his rival for the No6 jersey, is part of a Chiefs team fourth on the table and second in the New Zealand conference behind the high-flying Hurricanes. Both teams - along with the Highlanders - are in title contention which could present problems for the All Black selectors.
Blues loose forward Steven Luatua will be in the frame, as will Crusaders Kieran Read and Richie McCaw should their team not make the playoffs.
After the Samoan test the All Blacks go straight into a Rugby Championship which will be played over three rounds starting with Argentina in Christchurch.
Kaino said he hadn't heard from the All Black selectors, but that captain McCaw had been in touch.
"I got a message from Richie the other day asking how the injury was so I sent him a text with a picture of the dislocation. He was quite impressed."
Hurricanes and All Black first five Beauden Barrett has suffered a grade two tear of his medial collateral ligament and has been ruled out for four weeks.
"Obviously I'm gutted with the injury, but fortunately it's not season-ending for me," said Barrett.
The Hurricanes, the competition leaders, are hoping Barrett will be available for selection for their match against the Crusaders in Nelson on May 29.