He currently plays for Young Elephants, wearing the number 13 shirt. At the international level, he represents Laos U19. He plays primarily as a Midfield.

Across 2 appearances in the AFF U23Youth Championship 2023, Thanouthong·Kietnalonglop registered 0 goals and 0 assists, while completing 0 key passes out of 0 total passes with a passing accuracy of -.