The movie, which won two awards at the Cannes Film Festival - FIPRESCI, International Jury of Film Critics prize and Promising Future prize in the Un Certain Regard section, will hit theatres this Friday.
The celebrities have called the film "well made", "outstanding" and "brilliant".
"First love, innocence, heartbeats, earnestness, give and take, pain, loss, life, death, rebirth and continuous hope #Masaan," Koechlin posted on Twitter.
Praising the director's effort, Rao said, "OUTSTANDING! Top notch in every dept. Take a bow @ghaywan U've made a truly special film.@CastingChhabra @avinasharun20 hats off guys.#Masaan."
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Actress Richa Chadha's performance in the Indo-French co-production was applauded by her colleagues in the industry.
Director Shirish Kunder tweeted, "Special mention to @RichaChadha_ for her performance in #Masaan. Great work!"
"@RichaChadha_ steals the show in #Masaan how subtle controlled and intense. Way to go! @battatawada you were a delight. Big love," Radhika Apte said.
Besides Richa, the Varanasi-set drama also stars Sanjay Mishra, Shweta Tripathi, Pankaj Tripathi and Vineet Kumar.