"Had I been in place of Akhtar I would have sued the PCB for defamation over a medical inquiry," Khan said in a meet the press in Karachi.
Khan, who now is the member of Pakistan's National Assembly from his political party - Movement for Justice - played 82 Tests and 175 One-day games and also led his country to their only World Cup triumph in 1992.
"They (the PCB) have challenged the integrity of Akhtar by having a medical inquiry even though Akhtar's medical reports confirmed he was injured," said Khan.
"He has every right to sue the PCB for defamation". The PCB set up a medical commission to inquire whether Akhtar faked an injury during the decisive Test against India last month.
The suspicions over Akhtar injury, after the pacer fell in his follow through and did not take field on the third day of the Test but batted without any discomfort on the following day, were raised by captain Inzamam-ul-Haq and vice-captain Yousuf Youhana.