The Australian has played just seven times in the current campaign, only twice since October 24, and has not featured since February 26.
"It has been hard for Vinny because he's picked up niggly injuries and this one has been quite a big operation on his Achilles," Kean said.
"He has had the plantaris removed and hopefully he can get some rehab under his belt and look forward to an injury-free season next season.
"I think he won't play again this season."