Zivkovic walks out on Pompey
The Croatian international blamed poor trining facilities and being played out of position as reasons for his departure.
The unhappy player said: "My relationship with the manager has deteriorated in the past two to three months. I didn't feel like I was respected or wanted.
"He was always saying things were my fault in front of the other players in the dressing room. But he never said to me once that I played well.
"I feel my confidence has been totally ruined".