Pakistani actor-singer Ali Zafar says ailing ghazal maestro Mehdi Hassan is irreplaceable and has hoped that he recovers soon.

"Mehdi Hassan Khan Sahab. Jab tak aapka saya hum per rahay ga.

Humaara naata sachay sur say jura rahay ga. Khuda aapko sehat aur tandrusti de (As long as your blessings are with us, we will remain connected to divine music. May god bless you with good health and well-being), " Ali posted on his Twitter page.

"There is no singer like Mehdi Hassan, never was, can never be. Sir you are in all our prayers, " added Ali, who has acted in Bollywood films like "Tere Bin Laden" and "Mere Brother Ki Dulhan".

According to reports, the 84-year-old is currently in the intensive care unit of a Karachi hospital. He has been suffering from lung problems for the past 12 years.