"I've said to the players and the coach that I love them,but I love my wife and my family more. That's where my priority needs to be.
"It's never been my intention to move out early but that has become a necessity."
After a high-profile trade from the Hawks in 2016,the 35-year-old played 22 games for the Eagles last season before retiring and moving into West Coast's coaching ranks.
Mitchell wouldn't respond to speculation the Eagles will attempt to hold him to his contract,preventing him from joining a rival Victorian club.
But he insisted West Coast officials had thrown their arms around him.