At the international level, he represents Fiji U20. He plays primarily as a Defender. His current market value is estimated at 100K €.

His most recent move was a from Tailevu Naitasiri to Suva FC on 2025-01-01.

Throughout the FIFA U20 World Cup 2023, Gaery Kubu featured in 3 matches, averaging 1.3 tackles, 1.3 interceptions, and 1 clearances per game, while blocking 0 shots per game.