"I think it's really too soon for me to pass judgement on what sort of an actress Sonam is. I'll must work together with her after which probably I'll know better," the 28-year-old said here on the Radio Mirchi Music awards.
"Right now, so far as I'M concerned, she has an overly expressive face and i'm sure she is able to a lot more than she has already done," he added.
In "Raanjhanaa", both Dhanush and Sonam are from Varanasi they usually study in Delhi.
Meanwhile, the "Kolaveri Di" man had composed a Sachin Tendulkar anthem and says it feels great now that he has got his 100th international century.
"There is nothing new that I WILL say in regards to the Master. The song was aired a month ago and it's got 5 million clicks. Now that he has also got his 100th ton, it's really great," said Dhanush.
Dhanush is currently in Mumbai engaged on the dubbing of the Hindi version of his wife Aishwarya Rajinikanth's directorial debut "3".
