Another source close to Ratnam told IANS that there was nothing to worry.
"It's his yearly health check-up. Before he starts shooting, he usually checks in to make sure everything is alright. He is absolutely fine and he went in for a routine check-up earlier today," the source said.
Ratnam, who is gearing up to commence work on his next project, last had his annual health check-up in July 2018.
However, the "Roja" filmmaker had heart-related complications on the sets of "Yuva" in 2004. He has been under medical supervision since then.
Ratnam is all set to begin work on a cinematic adaptation of Tamil novel "Ponniyin Selvan". The film is a mega-budget multi-starrer and Aishwarya Rai Bachchan has already confirmed that she's part of the project.