The deal sees Clark join the Cats, Heritier Lumumba join Melbourne and Geelong midfielder Travis Varcoe move to Collingwood.
Clark joins the Cats after time at both Brisbane and Melbourne.
Drafted by the Lions at pick nine in the 2005 national draft, Clark debuted against the Cats in round 1, 2006. In 2009, Clark earned an All-Australian nomination and finished third in the club’s best and fairest.
After six years at the Lions, Clark moved to Melbourne in 2012 and was the leading goal kicker for the Demons that year.
The 26-year-old stepped away from AFL in April after being diagnosed with clinical depression but will now return to the field with Geelong.
Geelong general manager of football, Neil Balme welcomed Clark to the club.
“We are very pleased that Mitch will be joining the club, he is a welcome addition to our playing list,” Balme said.
“Throughout his career Mitch has proved he is a valuable and respected member of the Lions and Melbourne, and we are looking forward to what he will bring to our team.”
As part of the three-way trade deal, Travis Varcoe will become a Collingwood player.
Drafted at pick 15 in the 2005 national draft, Varcoe played 138 games and kicked 130 goals for the Cats after debuting in 2007.
A key member of the 2009 and 2011 premiership sides, the 26-year-old played 23 games this season.
Balme thanked Varcoe for his service to the club over nine seasons.
“We thank Travis for his years at the club and wish him well in his future career at Collingwood,” Balme said.
“Travis played a huge part in our success since joining the club. His role in the 2011 grand final will never be forgotten by Geelong supporters, but both Travis and the club see this move as being a positive for his career. He will always be a ‘Geelong’ person.”
