The former cricketers also called for weekly family visits to Khan, who has been imprisoned since August 2023.
Khan led Pakistan to its only 50-over World Cup title in 1992 before entering politics. He played international cricket from the late 1970s until his retirement in 1992, facing several of the sport's leading players during his career.
In February, 14 former international captains had expressed concern over Khan's health following reports of an eye condition that his family said had severely affected vision in his right eye. The government has denied allegations of medical neglect and maintains that Khan has been receiving appropriate treatment in prison.
The latest appeal comes after the Supreme Court ordered Khan to be transferred to Shifa International Hospital for specialist medical assessment and treatment. However, he was taken to the state-run Pakistan Institute of Medical Sciences (PIMS) on Thursday night instead, with the government citing security concerns.
Khan's family and PTI have accused the government of violating the Supreme Court's order, while the government has rejected the allegation.
The former captains urged the authorities to allow the medical board ordered by the Supreme Court, including Khan's personal doctors, to conduct a full and independent assessment of his health, particularly his reported loss of vision in the right eye.
The letter also called on the government to ensure that weekly family visits ordered by the Supreme Court take place without interruption or administrative delays.
The signatories further demanded that any treatment recommended by the medical assessment be provided without delay.
Among those who signed the appeal were former cricket captains Michael Atherton, Allan Border, Michael Brearley, Greg Chappell, Ian Chappell, Belinda Clark, Alastair Cook, Michael Gatting, Sunil Gavaskar, Adam Gilchrist, David Gower, Nasser Hussain, Clive Lloyd, Kapil Dev, Arjuna Ranatunga, Andrew Strauss and Steve Waugh.
The former cricketers said they were making the appeal not as politicians but as "former colleagues and rivals" who shared a bond through cricket.
They added that they did not seek to interfere in Pakistan's domestic legal proceedings, but wanted Khan's health concerns to be addressed through independent medical evaluation and appropriate treatment.
Khan has faced numerous legal cases since his removal from office in April 2022, including corruption and cases related to violence by his supporters. He denies wrongdoing and says the cases against him are politically motivated, while the government rejects allegations of political persecution.
The former prime minister has previously received treatment at PIMS for central retinal vein occlusion in his right eye, a condition that can impair vision.
