Born in Manipur, Thangjam was part of the AIFF Elite Academy batch that was preparing for the 2017 FIFA U-17 World Cup to be hosted in India.
[1] After the tournament, Thangjam was selected to play for the Indian Arrows, an All India Football Federation-owned team that would consist of India under-20 players to give them playing time.
[2] He made his professional debut for the side in the Arrow's first match of the season against Chennai City.
He started and scored the third and final goal in the 90th minute for the Indian Arrows as they won 3–0.
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