Openside flanker Sam Cane has become the second player to commit to the All Blacks through until 2021.

The 25-year-old has joined hooker Codie Taylor in deciding to stay for another four years, it was confirmed on Monday.

"Even though I've been in the All Blacks for five years now, there is still heaps more I want to achieve in the black jersey," Cane said.

"I'm in a leadership role with the All Blacks and the Chiefs and that's something I enjoy, and I want to contribute any way I can in helping lead and drive both those teams to succeed."

Cane has played 49 Tests since his debut in 2012.

All Blacks coach Steve Hansen said Cane's re-signing is significant.

"He's grown hugely as a player since he came into the All Blacks five years ago.

"He's part of our leadership group, has captained the side on two occasions and he continues to play to the highest standards whenever he takes the field and never lets the jersey down.

"He's still a young man and knowing that he's staying through to 2021 is fantastic for the long-term growth of the All Blacks."

Sam Whitelock, Ben Smith and Anton Lienert-Brown have signed through to 2020, while the bulk of the current side are committed until 2019.