Rajat, who has directed films like "Mithya", "Mixed Doubles" and "Ankhon Dekhi", shared a link of a campaign.
"'RK/RKay' will be made in 2018 with your help! We need you - look at the link below, click on it, make a contribution no matter how small, it will still be huge," Rajat tweeted.
Kalki commented: "A filmmaker who should be making films much more often!"
Kalki and Rajat, both theatre enthusiasts, have been seen together in films like "That Girl in Yellow Boots" and "Waiting".
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)