McAvoy's mindset certainly seems to be in the right place to make that a reality.
Despite the success he has achieved at such an early stage of his career - including the mammoth extension he signed on Friday - the Long Beach, New York, native knows there remains plenty of work to be done should he want to be considered in the same category as the greats that have come before him.
"I know I have so much to give and so much to grow and I want to continue to grow into the very best I can be. There is no complacency," said McAvoy. "There is where I am now and where I feel I can get to. Every year, I just want to continue to make strides."
McAvoy, who finished fifth in the Norris Trophy voting last season, should be in position to elevate his game even further during the upcoming 2021-22 campaign as he takes on more responsibility as Boston's No. 1 defenseman. In addition to his elite 5-on-5 play and stellar penalty killing, McAvoy will begin the year as the point man on the B's top power-play unit.
"We know he can play 5-on-5 against the best players, we know he can transition through the neutral zone, O-zone blue line, see sticks. We talked about shooting more, he's trying to build more of that into his game. Now the power-play responsibilities is one more thing on his plate that you keep working with him on," said Cassidy, who also noted that McAvoy will likely see even more time on the PK and in the closing minutes of games.
Cassidy admitted there is plenty of added pressure that can come with all of that increased responsibility. But McAvoy - while acknowledging he always aims to "play a perfect game" - is looking to take it all in stride.
"I don't want to put the world on my shoulders," said McAvoy. "Hockey is a team sport and there are so many incredible players in our room. I think that's one of the best things about our team is our depth. On any given night, guys are gonna step up.
"My expectation for myself is to play a perfect game, which is never actually what happens. But that's sort of the pedigree of what I want to hold myself too…I want to be that guy every night. But we have the depth and talent in here for everyone to pull on the rope."
McAvoy also said he is grateful to have so many people around him that he can lean on as he transitions into the next chapter of his career.
"I just consider myself blessed because I have those guys who are there who I can go to for everything and they're gonna have my back," said McAvoy. "I have so many resources here, so many brothers on the team that I can talk to about things like that…you don't want to have all that pressure, that weight, but the standard that I hold myself to, sometimes it can creep in.
"I have those resources and those people to keep me grounded - my family, my team, coaches, everybody. The support system is incredible for me, and I just get to play hockey."
And the Bruins are thrilled that, for eight more years, he'll be playing hockey in Boston.