"Suddenly felt awful yesterday while driving back from the match to know Rajni sir is unwell. He is our superhero... insha allah he will be well soon," Shah Rukh wrote on micro-blogging site twitter.

"I was worried after hearing that Rajnikanthji is not well. So I called up her daughter and she says he is fine now. I wish speedy recovery for him," singer Lata Mangeshkar tweeted.

Rajinikanth is in the Intensive Care Unit (ICU) of Sri Ramachandra Hospital in Chennai. The actor fell ill on the first day`s shooting of his new film `Rana` (The Monarch) last month.

Veteran actor Dev Anand tweeted, "I pray for my dear rajini`s sound health and speedy recovery (sic)"