"I am profoundly saddened to receive the news of the death of A.P.J Abdul Kalam, former President of India and renowned scientist of the world," Ghani wrote.
"I partake of the tremendous grief of the Indian people and hereby offer my deepest condolences and sympathies to Your Excellency and the bereaved family of late A.P.J. Abdul Kalam," he added.
Ghani mentioned that Kalam had "served his nation exemplarily as a pioneer scientist and 11th President of India. I am confident that the great nation of India will always remember the services and achievements of this great man.