"It just really happened over the last, like, 48 hours," Chandler told ESPN 103.3's "Ben and Skin Show."
The New York Times also reported that Chandler's pact with the Knicks will be in the vicinity of $58 million over four seasons.
Chandler, 29, played an integral role in the Dallas Mavericks capturing their first-ever NBA championship last season. He averaged 10.1 points, 9.4 rebounds and 1.1 blocks per game, providing a legitimate interior defensive presence which previous Dirk Nowitzki-led Mavericks teams had lacked.
"I just think the future of the team, being able to play alongside Amare Stoudemire, Carmelo Anthony and the young talent we have, I feel like it puts us contention over the next four or five years," Chandler continued.