In the official poster, Sonakshi is seen sitting gracefully with her face half covered in a niqab.
Sharing details about her role, Singh said: "It is an imperative role. It is a special appearance but very pivotal. At this point I would like to reveal as little as I can but all I can say it adds a glamour quotient to the film. She is super smart, tuned in, a fabulous actor and totally professional."
Laal Kaptaan features Saif Ali Khan in the lead role of Naga Sadhu. Co-produced by Eros International and Aanand L. Rai's banner Colour Yellow Productions, the film releases on October 18.