"He has been a big part of our success and a fantastic servant of the Chiefs. He has been a massive contributor to our team and will be greatly missed. We also appreciate that it is a great opportunity for him and wish him all the best for his new move."
Leonard is in his seventh season with the Chiefs.
He played in 13 All Blacks tests and appeared 63 times for Waikato. The timing of his departure means he will be unavailable for Waikato for this year's ITM Cup.