The Kiwi international told the Herald he remains determined to help the Warriors improve and achieve success after injury and poor results marred the last two seasons.
Remaining in Auckland was also a big factor in his decision, as he looks forward to moving into the next chapter of his life with his fiancée Ashley Walker.
"It just ticked a lot of boxes for me," Tuivasa-Sheck said.
"This is where I want to be in this stage of my life. I want to be in Auckland with my family and my partner Ashley and the opportunity to play footy and the challenge was here.
"I like driving myself to meet a challenge and that's what's here at the Warriors.
"Unfortunately we haven't gone so well so that's really burning inside me to change that."
George was thrilled the club were able to secure Tuivasa-Sheck's talents long-term and believes the length of his new contract sends an important message to Warriors supporters and stakeholders, while giving the club a tremendous boost going into round one.
"We have one of the superstars of the game demonstrating to our fan base and corporate partners that he believes in what we're doing here," said George.
"And there wasn't any shortage of interest around his services, so for him to put us above and beyond any other opportunity presented to him is a real credit to the club and to our members and fans.
"Roger has that burning desire for this club to succeed. He's passionate about doing it for our fanbase and really wants to lead us down a path where we all want to go.
"As a footballer he's going to develop into one of the best of all time, I've got no doubt about that, and likewise as a leader.
"To have him choose this club above all of the other opportunities is really good."
Warriors coach Stephen Kearney reiterated George's comments, describing the announcement as "fantastic news".
"It's a real positive," said Kearney.
"What is says is he's a young guy who's really driven to succeed and he's committed to the club so he wants to see that success here at the Warriors.
"It's wonderful news for the team, members and everyone involved in the footy club."
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