An internal player dispute at Geelong could further cloud Mitch Clark's future at the club.

It has emerged that the troubled forward fell out with teammate and club leader Mitch Duncan following a sledging incident at a VFL game.

Clark is understood to have directed the sledge to senior-listed Hawk Teia Miles during a match against Box Hill Hawks. He allegedly disparaged Miles' sister, who is the long-term partner of Clark's Cats teammate Duncan.

The on-field sledge occurred at Simonds Stadium three weeks ago and resulted in a confrontation between Clark and Miles. Duncan, a member of Geelong's leadership group, became aware of the comments later.