The midfielder, who has been with the club for five years, penned fresh terms at Melwood on Friday morning to further prolong that stay.
“It is massive, coming from a massive club like Liverpool, so I’m happy,” he told Liverpoolfc.com after signing the contract.
“I was excited to get it done. It took a lot of hard work to get this, but thankfully it is done. Hopefully I can carry on working hard and get to where I want to be.”
Kane also agreed the formalities to remain with League One side Doncaster for the rest of 2018-19.