"I'm not sure if I'll be back next season," he admitted.
"Our team has underperformed. I think that we're all open to evaluation, and that's what's going to come.
"No one's harder on myself than I am, when it comes to our performance. We have passionate fans; they have ever right to voice their displeasure with how we've performed this year."
Gillis and team ownership will review the entire team once the season concludes and decide what roster changes need to take place.
The Canucks almost traded center Ryan Kesler and defenseman Alexander Edler prior to last month's trade deadline, but both deals fell through and are expected to be revisited this off-season.
While Kesler and Edler could be dealt, the Canucks are still going to be in the market for significant upgrades, as their goal is to compete for the Stanley Cup next season.
"We will try our hardest to spend to the cap providing it's the right players and the right ages and the right positions," Gillis said. "There's not going to be a ton of free agents out there, but we've managed to do well in the first week of July in the past four or five years."
Asked about head coach John Tortorella's future with the club, Gillis indicated that he will be evaluated, just like himself and the rest of the team.
"John's a proven winner. He's a competitor. This season has been difficult to describe," Gillis said. "John, like myself, and like everybody, will go through a thorough evaluation at the end of the year and decisions will be made."
Contract talks with pending restricted free agents Zack Kassian and Christopher Tanev are expected to occur once the season ends.
Until someone tells him otherwise, Gillis is moving forward as if he's still the GM of the Canucks. He has a set goal for next season, which is fairly simple. He wants to win.
"We've had a lot of success in the past," he said. "None of this sits well with me. It's been an incredibly frustration season on a variety of different levels.
"I'm tired of chasing a moving target. We're going to get back to the fundamentals and principles that I believe in, and that's how we're going to play. If people don't want to comply -- we did this six years ago, we made hard choices -- those hard choices are going to come again if we don't see people that get on the same page."