Earlier, it was reported that the biography was to be launched on Dilip Kumar`s 90th birthday on Dec 11, 2012.
"The book is almost ready and we are planning to launch his biography in October. The date is not yet fixed,"Nayar told IANS.
"As soon as Dilip saab is well enough to launch it, we shall do it. There is immense improvement in his health so we may soon launch the book," added Nayar.
In September, Dilip Kumar was admitted to a hospital after suffering a heart attack and currently he is recuperating at home.
When asked whether is was planned to release the book on Oct 11, Dilip Kumar and Saira Banu's wedding anniversary, Nayar said: "No, not so soon as it's not completely ready yet. It will go further may be to the end of October. We also need somebody big to release it."
The two-part book focuses on the actor's nine-decade long journey, his love story with Saira Banu, some untold stories as well as rare pictures of the thespian and his family members.
In the past, three books on Dilip Kumar by Vinita Lamba, Sanjit Nawrekar and Lord Meghnad Desai have been published.
One of the best performers on the silver screen, Dilip Kumar was active in front of the camera for six decades and worked in much appreciated films like "Jwar Bhata" "Mela", "Naya Daur", "Tarana", "Devdas", "Ganga Jamuna", "Leader", "Mughal-E-Azam", "Shakti", "Karma" and "Saudagar".
His last film was 1998 release "Qila".