Former England player and well-known television commentator Robin Jackman has been diagnosed with cancer and will undergo seven weeks of treatment through radiotherapy."It's not the prettiest, but I got it early and I'm confident I'll be fine," Jackman was quoted as saying. "I won't be in Australia [for South Africa's upcoming Test series], but I sure will be rooting for the Proteas." According to a report in Supersport, Jackman has already had two operations to remove malignant tumours from his vocal cords. The 67-year-old has been advised four weeksâ rest and is expected to return to commentary early next year.Jackman's diagnosis has come after two more former cricketers - New Zealand's Martin Crowe England's Tony Greig - were diagnosed with the disease recently.Jackman represented England in four Tests and 15 ODIs. He was involved with Surrey for 16 seasons starting from 1966. In his domestic career, Jackman scored 5681 runs and took more than 1400 first-class wickets. Although he was born in India and grew up in England, he maintained close ties with South Africa.