"He is still very critical. Very much with us," Ram Narain, COO, Kokilaben Dhirubhai Ambani Hospital, told Tuesday morning.
The 84-year-old was admitted to the hospital Saturday following a severe cardiac problem, which later led to a kidney malfunction.
In his prime, Dara Singh was a world-famous wrestler and won the title of "Rustam-e-Hind" for his prowess.
He entered the film world in the 1952, and featured in movies like "Watan Se Door", "Daada", "Rustom-E-Baghdad", "Sher Dil", "Sikandar E Azam", "Raaka", "Mera Naam Joker" and "Dharam Karam".
He is also remembered for his portrayal of Hanuman in 1980s TV series "Ramayan".