Collingwood says it's not concerned with Daniel Wells' injury history, with the 31-year-old set to join the club as a free agent.

The classy midfielder officially told North Melbourne on Monday he would be leaving the club after 14 seasons with the Kangaroos.

North Melbourne midfielder Daniel Wells is bound for Collingwood. Credit:Getty Images

Fairfax Media understands Wells knocked back a two-year $1.1 million contract at the Kangaroos to sign a three-year $1.8 million deal at Collingwood.

The deal at North Melbourne would have involved triggers for him to earn that much, based on how many games he played and where he finished in the best and fairest.