In Norway Nguen made his debut for
Strømsgodset on 28 August 2011 against
Fredrikstad. The game ended 1–1. He was injured most of the
2012 season, and only played four minutes in one match as a sub. On 10 August 2015, he was loaned out to
Tippeligaen club
Mjøndalen for the rest of the 2015 season.
Ferencváros In June 2020, Nguen was given a written warning by the
Hungarian Football Federation for celebrating his goal for
Ferencvárosi TC against
Puskás Akadémia FC by displaying a message on his undershirt condemning the
murder of George Floyd. Ferencváros ultras are notoriously oriented towards the
political right, so they did not necessarily approve of this political message. On 16 June 2020, he became champion with Ferencváros by beating
Budapest Honvéd FC at the
Hidegkuti Nándor Stadion on the 30th match day of the
2019–20 Nemzeti Bajnokság I season. On 29 September 2020, he was member of the Ferencváros team which qualified for the
2020–21 UEFA Champions League group stage after beating
Molde FK on 3–3 aggregate (away goals) at the
Groupama Aréna. In the first round of the
2020–21 UEFA Champions League he scored twice against
2019 Allsvenskan-winner
Djurgårdens IF Fotboll at Groupama Aréna on 19 August 2020. He scored his first group stage goal against
FC Dynamo Kyiv, a 59th minute goal to bring the match to 2–1.
Ferencváros would eventually equalize in the 90th minute. On 20 April 2021, Ferencváros won the
2020–21 Nemzeti Bajnokság I season by beating archrival
Újpest FC 3–0 at the Groupama Aréna. The goals were scored by
Myrto Uzuni (3rd and 77th minute) and Nguen (30th minute). In Hungary, he is nicknamed "tökmag", Hungarian for
pumpkin seed, because of the resemblance of his name (Tokmac) and the hungarian noun (Tökmag). On 5 May 2023, he won the
2022–23 Nemzeti Bajnokság I with
Ferencváros, after
Kecskemét lost 1–0 to
Honvéd at the
Bozsik Aréna on the 30th matchday.
Djurgårdens IF On 25 March 2024, Nguen joined Djurgårdens IF signing a two-year deal. On 8 April 2024, Nguen made his Allsvenskan debut, coming off the bench in the 79th minute at home against
BK Häcken, helping the team come back from 0–3 to a 3–3 end result, scoring two goals.
Al-Okhdood On 17 January 2026, Nguen joined
Al-Okhdood. ==International career==