Born in Manipur, Blessed with raw pace, Singh started his career at the prestigious Tata Football Academy. While with Tata, Singh shined at the academy during the Darjeeling Gold Cup, Saras Gold Cup, and the I-League U19 in 2014. He also represented the state of Jharkhand during the 2011 National Games of India. Singh also represented India during the Nike All Asia Camp in Australia, which he, and teammate Alen Deory, were selected for the All-Star team. Singh ended his Tata Football Academy career by helping his side win the 2014 I-League U19 and in the process he became the golden-boot winner with nine goals during the tournament.
On 15 July 2014 it was announced that Singh had signed a professional contract with Bengaluru the reigning champions of the I-League, the topmost professional league in India. He made his debut for the side during the Durand Cup on 30 October 2014 against Mohammedan. He came off the bench for the start of the second half and played the full half as Bengaluru FC won the match 2–1. He then made his professional debut during the same tournament at the semi-final stage when Bengaluru FC took on Salgaocar. He once again came off the bench and scored his penalty during the penalty shoot-out but could not help his teams cause as Bengaluru FC fell on penalties 4–5. Udanta made his I-League debut in a 4–1 win against Sporting Goa on 31 March 2015, coming on as a substitute for Sean Rooney. Udanta assisted skipper Sunil Chhetri for the winner in an AFC Cup group stage game against Maldivian side Maziya on 28 April 2015, thus becoming the youngest Indian player to provide an assist in AFC competitions. He scored his first goal for Bengaluru on 12 May 2015 in an AFC Cup game, where he opened the scoring in an eventual 3–1 defeat to Persipura Jayapura, thus becoming the youngest Indian goal scorer in AFC Cup. After the season ended, Singh was rewarded with a two-year contract extension. Udanta was excluded from the 2015 Indian Super League draft by Bengaluru FC, opting to send him on a training stint at English club Oxford United in the League 2. Udanta scored his first I-League goal of the 2015–16 season on 2 March2016 against Shillong Lajong, in a game where he was adjudged the man of the match. In the first league game of the 2016–17 season Udanta scored twice as Bengaluru beat Shillong Lajong 3–0. Afterwards Udanta was named man of the match with his second goals being described as a "beautiful volley." He was also named as player of the week by a newspaper for his performance in that match. Udanta scored a goal and assisted 7 times for Bengaluru during the 2017–18 Indian Super League season during which his team finished as runners-up. He also was a regular for his team during the AFC Cup where he scored once. For the 2018–19 ISL season, Singh scored 5 times and assisted thrice as his team ran out champions of the tournament. He scored one goal in the 2018 AFC Cup as well.
International
Udanta was selected to join the India U19 team in 2013 for the AFC U-19 Championship qualification where he started all 4 of India's matches, scoring once against Turkmenistan U19s. Udanta had his senior debut on 24 March 2016 in a qualifying match against Iran. On 1 June 2018, he scored his first goal in India's 5–0 victory over Chinese Taipei.
