Cahill struggled for playing time at club level last year and left A-League side Melbourne City in December to return to Millwall -- where he first came to prominence 20 years ago -- before being released by the Championship club.
Bartholomew Obgeche (20th minute) gave the hosts early lead before Farukh Chaudhary cancelled out his strike in the 49th minute.
Jamshedpur piled up the pressure as the first-half progressed but their final delivery into the box lacked clarity. Mario Arques struck a dangerous free-kick at Gurpreet Singh's goal but it sailed inches over the bar.
A summary of sports events and persons who made news on Saturday