The 26-year-old joined Leeds from Brisbane in 2015, originally signing a two-and-a-half year deal. He is delighted that he has extended that deal now.
“With how everything has panned out this season, I was delighted to sign a new deal and commit my future to the Rhinos,” he said.
“I am really excited about how things are going for the future. This is the most I have ever enjoyed my footie and I can’t wait for next season.
“I am looking forward to experiencing the weather this winter during pre-season and I think I will be better for it.
“My family and I have adapted well to life over here in England and a lot of that is down to the club and how well everything has been done for us from the moment we stepped off the plane from Australia; everything was pretty easy from that point onwards.
“We are aiming to settle down in Leeds and we have been made to feel so welcome, not just by the staff and players at the club but also the fans who have been great as well.”
Leeds head coach Brian McDermott is very pleased that the front rower, who will wear number 17 next season, has committed to the club.
“It is remarkable how well Mitch has fitted into our culture since he arrived here last year,” he said.
“He deserves a lot of credit for that because of his attitude and professionalism. The prospect of him having a full pre-season with us is exciting given how well he has settled in since he arrived and I am delighted he has committed his future to the club.”