As revealed by AFL.com.au's Mitch Cleary, it is understood that the veteran midfielder sustained the injury in the Cats' thrilling Round 23 loss to Melbourne, and has since carried the injury into the post-season.
Dangerfield was placed on the bench for a prolonged period late into the four-point loss to the Demons and was sidelined for key stages of the final term.
The 31-year-old played in Friday night's qualifying final loss to Port Adelaide with some of his fingers wrapped in tape and requiring extra protection.
Dangerfield has received treatment on the injury, however the club is yet to confirm the extent of the damage.
Having played through a majority of the qualifying final, it is unlikely the Brownlow medalist will miss his side's must-win semi-final against Greater Western Sydney on Friday.