Unfortunately, the Oilers are likely going to need to explore their options to replace him this year, at least to start the season.
It'll be interesting to monitor Kane's recovery. Considering that in the past, many teams used the LTIR to circumvent the salary cap, such as Stanley Cup champions Tampa Bay Lightning and Vegas Golden Knights, the Oilers could consider activating him for the playoffs and going over the cap limit in the postseason games, possibly giving them a big edge on their opponents.