[6] That year, the senior team won the league championship in the playoffs after being tied on points with Erchim FC (but with an inferior goal differential) following the regular season.
[10] In May 2014, Ganbayar was named the best player in the under-15 category of Sensation-2020, an annual national high school football tournament under the auspices of the president of Mongolia.
[17][18] In 2011, Ganbayar participated in junior camps held by Italian Serie A club AC Milan in the Mongolian capital of Ulaanbaatar.
[19][20] Because of his performances with the Mongolia Under-14 team in 2013, he attracted interest from Académica de Coimbra of the Portuguese Primeira Liga.
[21] In March 2016 Ganbayar, along with fellow Mongolian Soyol-Erdene Gal-Erdene and Mongolia national team coach Zorigtyn Battulga, traveled to England to train with Barnet FC of League Two for a month at The Hive Stadium.
In September 2016, it was announced that Ganbayar had accepted a year-long residency with the youth academy of Puskás Akadémia of Hungary's Nemzeti Bajnokság II.
[27] On 21 January 2017 he was in the starting lineup as the under-17 team played a friendly match against the under-17 side of Croatian Prva HNL club NK Osijek.
[33] He appeared as a second-half substitute in the tournament's opening match, a 1–0 victory over German giants FC Bayern Munich.
[37] On 11 April 2018 it was announced that Ganbayar had returned to Mongolia on loan to play for Ulaanbaatar City FC on a one-year, ₮6,000,000 per month contract until October 2018.
[42] Ganbayar returned to Hungary in early August 2018 after making two league appearances and scoring one goal for Ulaanbaatar City FC.
After coming on as a second-half substitute against Debreceni VSC's under-19 side, Ganbayar scored his first league goal for the club six minutes later in the eventual 1–3 defeat.
[51] In July 2020, it was announced that Ganbayar had joined Aqvital FC Csákvár of the Nemzeti Bajnokság II, Hungary's second tier league, on loan.
[55] Ganbayar made his league debut for the club on 2 August 2020, coming on as a second-half substitute in the team's opening match of the 2020–21 NB II season.
[56][57] Ganbayar scored his first league goal for the club on 23 August 2020 in an eventual 2–2 draw with Kaposvári Rákóczi FC.
[58] In late August 2020, Ganbayar was loaned back to Puskás Akadémia FC and named to the senior squad to face Sweden's Hammarby IF in the teams' opening match of 2020–21 UEFA Europa League qualification.
[19] For this inaugural edition of the tournament, Mongolia competed in Group G against Hong Kong, DPR Korea, Macau, and Japan.
The Mongolian U14 team won their first match 7–0 against Macau before losing 0–4 to Japan, 0–8 to North Korea, and 0–5 to Hong Kong.
[69] In June 2017 head coach Michael Weiß named Ganbayar to Mongolia's roster for 2018 AFC U-23 Championship qualification which was scheduled to take place the following month.
[71][72] Following the match, the team departed for a 12-day training camp at the Mokpo International Football Center in South Korea in partnership with the KFA.
[74] Ganbayar then appeared in the team's next match, a 1–2 defeat to Jeju United who finished the 2016 season in third place in the K League Classic.
He sustained a hamstring injury while training in Phuket, Thailand but was expected to heal in time for the opening match.
[90] Ganbayar went on score his first two senior international goals in 2–0 2023 AFC Asian Cup qualification victor over Yemen on 14 June 2022.