In 2013 Manjit took part in his first international event, in the 2013 Asian Athletics Championships, at Pune, where he finished 4th place in the Men's 800 metres final clocking 1:49.70 mins. In 2014, he bagged a silver in the 800 metres in Federation Cup, but failed to qualify for the Commonwealth Games and Asian Games. After a long injury for one and half year, he took part in the National Inter-state Championship at Hyderabad winning silver then at Guntur and bettered his 800 m time, clocking 1:48.04 mins and winning silver on July 16, 2017. In the same event, on 18 July, he competed in the 1500m and finished with a timing 3:49.30 which was his personal best at that time.