Mantha's .88 points per game in 2019-20 led the Wings, marking the highest points-per-game total for Mantha in his four-plus NHL seasons.
The winger said he believes he can reach the magic number of 30 goals this season if the campaign is played as planned and if he stays healthy.
"Obviously (2020-21) is up in the air, but everyone talks about that magic 30," he said. "I think it's something that's reachable for me in the real near future. That's the goal I'm set on right now."
At 26 years old and on his second contract since being drafted by the Red Wings with the 20th overall pick in 2013, Mantha was two years away from entering unrestricted free agency before Tuesday's deal.
Yzerman didn't want to let that happen, though, saying he's happy with Mantha's progression and that Mantha is one of the core pieces to the Red Wings' puzzle.
"Obviously, he's one of our best players, a key player on our team," Yzerman said. "We're trying to build around this group, and each contract that we do, we're trying to make it work within what we're trying to do."
Mantha debuted for the Red Wings as a 21-year-old in March 2016 and said it's a surreal feeling that he's becoming one of the older players on the team and a veteran presence in the locker room.
"It's going to be awesome. It's crazy to think that at 26, you're in the second half of the oldest guys on the team," he said. "Obviously, we have all these young guys that will roll up maybe this year, maybe next year. So, it's going to be exciting to see, and I'll help them out for sure."
Now that he's got his deal done, Mantha can focus solely on the upcoming season.
He returned to Detroit from his hometown of Longueuil, Quebec in September and has been working out with his teammates, preparing for whenever this uncertain 2020-21 season may begin.
"The guys are anxious to get back out there," Mantha said. "We didn't have a competition or anything of that sort in the last eight, nine months already. So the guys want to get back out there. Hopefully we could have an estimated time for us to actually have a date."
And as he looks toward next season, Mantha said he's excited about the new pieces the Red Wings have added this offseason.