At the time, Richmond CEO Brendon Gale said the Tigers had spoken with King a number of times about his relationship with Mitchell, who the 29-year-old has said is a family friend.
However, Gale also said the Tigers did not have "hard and fast rules" about who players could associate with.
"We've brought it to Jake's attention that he should think long and hard about those sorts of friendships and connections and associations, particularly in light of the events of this year," Gale told SEN in December.
"We're particularly mindful with the circumstances this year with the (Australian) Crime Commission report (into links between sporting figures and criminals).
"We certainly brought it to Jake's attention and others at the club, like all players at all clubs, they should be mindful of those associations.
"We don't offer directions and hard-and-fast rules to our players about who they should and shouldn't (associate with); we provide advice (and) guidance, but we expect them to make their own decisions."
Last season King invited Mitchell into the Richmond rooms following the Tigers' round 20 win over the Brisbane Lions at the MCG, prompting the club to tell him the association was unacceptable.
Richmond went on to warn its entire playing list not to associate with criminals in any way.
AFL chief executive Andrew Demetriou said the forward's decision to invite Mitchell into the club's rooms was "pretty stupid" and expressed concern people of certain backgrounds had the potential to "infiltrate" the code.
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