Imran Farhat says he has been served legal notice by the Pakistan Cricket Board after joining the unofficial Indian Cricket League.
The Test opening batsman has been asked by the PCB to explain how he joined the rebel Twenty20 league in India whilst still meant to be centrally contracted by them.
The PCB are also unhappy at comments attributed to Farhat saying they were biased in not picking him for the Twenty20 World Cup and allegations of unjust treatment by the board.
"I have received this notice and my lawyer will now respond to it appropriately. I am not going to back down from my stand," Farhat told Reuters on Tuesday.
"I maintain I have not been treated justly and I asked them to release me from the central contract before signing up for the ICL."
The PCB believe Farhat has violated the terms of his central contract by signing to play in another league without permission.
The board are also not happy as Farhat's comments of bias aimed at the selectors, and have asked him to substantiate any claims he has.
Farhat decided to join the ICL in India as he did not see a future for him in Pakistan cricket any more, and insists he has done nothing wrong.
"I have done nothing wrong by joining the ICL," he added.
"I didn't think I was being treated fairly and would not get a chance to play for Pakistan.
"Being a professional cricketer I need to earn my livelihood."