The two actors were previously rumoured to have been romantically involved.
"Both Neil and Asin were supposed to present awards at the award function," a source told DNA India: "Backstage, there is a room for the presenters to come and get ready and apply final touches just before they are supposed to go on stage.
"It so happened that Neil was already in the room getting ready, when Asin was escorted inside. But to everyone's surprise, she simply refused to go inside."
The source added: "She saw Neil in the room, and refused to go in. She told her entourage to wait there and she stood outside. Only after Neil stepped out did she enter the room. As soon as Neil walked out of the room, Asin entered. They didn't even meet or saw hello to each other."
In July, the actress is said to have dumped Mukesh by text after he complained about her close friendship with Salman Khan.