Drafted into Royal Wahingdoh at 19 in 2011, he repaid the trust reposed in him four years later when he helped the club gain promotion to the I-League in 2013-14. He scored his first I-League hat-trick against Salgaocar in May 2015.
Seityasen’s performances earned him a chance to play for India and he made his debut on June 11, 2015 against Oman in the 2018 FIFA World Cup Qualifiers. He impressed for the Highlanders in Hero ISL 2015, finding the back of the net once. However, there will be more expectations from him in the third edition of the league.
- Made debut for the Indian national team against Oman on 11th June 2015.
- 3rd , I-League 2014 -15 (Royal Wahingdoh)