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The 31-year-old has signed a short-term contract with Northern Cricket California Association and is open to exploring a long-term future which will sever his ties with Pakistan cricket.
The PCB did not get into the specifics of the breach committed by Akmal.
Akhtar went on to say that the legal notice is based upon lies from Tafazzul Rizvi and he stands by his words.
Umar Akmal has been banned by the PCB from all forms of cricket for three years after pleading guilty to failing to report match-fixing approaches.
Akmal has been banned from all forms of the game for three years on corruption charges.
Umar was banned by the Pakistan Cricket Board from all forms of cricket for three years in April after pleading guilty to failing to report match-fixing approaches.
Akmal was sent home from Pakistan's 2017 Champions Trophy squad for failing fitness tests and followed that up with a public outburst against coach Mickey Arthur. He was recalled for the first time since that spat for the five-match series against Australia.
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