St Kilda will have co-captains in 2021 with Jack Steele joining incumbent leader Jarryn Geary as skippers of the club.
"To have 'Gears' alongside me is also really special. He's really taken me under his wing, and I've learned so much from him since joining the club. His leadership is second to none, not just his voice on-field, but also how he rallies the group off it," Steele said.
Defender Dougal Howard has also been fast-tracked straight into the seven-man leadership group as vice-captain alongside Tim Membrey.
Callum Wilkie is a first-time inductee and joins last year's members Seb Ross and Jack Billings.
Jack Steele signs a new two-year deal with St Kilda to remain at the club until the end of 2022.
"As pleasing as Jack's performances in 2020 have been, his leadership and positive influence on his teammates have been equally as impressive. He's an incredibly competitive footballer, and also a very popular, humble and well-respected player off the field," Saints head of list management James Gallagher said.
"He has all the character attributes that we value at St Kilda, so we anticipate a great future for Jack, alongside the emerging group of younger players that have become the core of our senior team this year."
Collingwood will be without star midfielder Steele Sidebottom for the next four games when he leaves the Magpie's Queensland hub to be with his partner for the birth of their child.
"He's 95 per cent pumped to get back and be with his partner and to go through the next couple of weeks. He's five per cent bummed that he's missing what is the next couple of weeks of our campaign," Collingwood coach Nathan Buckley said.
St Kilda lands Port Adelaide pair Dougal Howard, Paddy Ryder, pick 10 and a future fourth-round selection in exchange for selections 12 and 18 and a future third-round pick.
Howard's agent, David Trotter, of Hemisphere Management Group, confirmed his client had penned a five-year contract with St Kilda.
"It's great that we got the deal done. Port and St Kilda were both really good throughout the whole process," Trotter told AFL.com.au.
"'Dougs' loved his time at Port. The move to the Saints, who see him as a genuine key defender and are bringing him in in that role, really excites him with the young list.
"He's got a couple of good mates there in Jack Steele and Logan Austin who he's excited to be joining, and he's looking forward to hopefully, some more players coming in over the next 24 hours and building from there."
Steele Sidebottom admits he didn't perform at his best in Collingwood's Grand Final loss to West Coast.
"The Grand Final wasn't my best game but it's not the end of me, that's for sure. I'm confident in my ability no matter who I play against, and I'm confident that even if I'm not playing my best footy that I'll still be competitive," he said.
"It's obviously disappointing because Grand Finals are the games you most want to play well in, but I'll be fine. I'll just continue to keep things simple, and I'm looking forward to getting back out there and playing some good footy."
St Kilda secures Jack Steele from Greater Western Sydney in a swap for a future second-round pick in the 2017 NAB AFL Draft.
"We’re thrilled to have Jack join the Saints and with his ability to play both in the midfield and forward, we think he’ll strongly complement our young, emerging list while filling a key need," St Kilda chief operating officer Ameet Bains said.
"Jack’s had some strong performances and at only 20-years-old we think he has a lot of potential to continue to develop and be a quality player for the club."
Jack Steele could have played his last game for Greater Western Sydney after suffering a season-ending foot injury.
Steele was injured at the Giants' training session at Tom Wills Oval on Tuesday morning, and subsequent scans on his left foot have ruled him out for the remainder of 2016.
The 20-year-old will consult a specialist on Wednesday to work out a plan for his rehabilitation.
Steele hadn't played senior footy since fracturing his hand in the club's round 17 win over the Brisbane Lions at the Gabba, but has been in outstanding form in the NEAFL, and gathered 41 possessions to help the reserves into Sunday's grand final against the Sydney Swans.
The Canberra boy, who has played 17 games in his two years at GWS, is out of contract at season's end and is in high demand with more than one Melbourne club.
Coach Leon Cameron said it was disappointing news for Steele, but he's hoping to see him in Giants' colours again next year and beyond.
"We're really excited with where he's heading, and he's absolutely a wanted player at our footy club," Cameron said.
"We're feeling for him at the moment because he was on the verge of possibly playing AFL footy this week, if not he was going to play in a grand final on Sunday."