Marmoush made his professional debut for Wadi Degla in the Egyptian Premier League on 8 July 2016, coming on as a substitute in the match against Al Ittihad Alexandria Club, which finished as a 3–2 win. In total, he made sixteen league appearances for Wadi Degla and scored two goals, before moving to VfL Wolfsburg II in 2017.[2]
VFL Wolfsburg
On 26 May 2020, Marmoush made his professional debut for Wolfsburg in their 4–1 win over Bayer Leverkusen in the Bundesliga at the BayArena. Marmoush signed his first professional contract for the club on 23 June. On 5 August 2020, Marmoush made his European debut in a 3–0 defeat (5–1 agg) against Shakhtar Donetsk in the UEFA Europa League round of 16. Marmoush returned to Wolfsburg after his breakthrough Bundesliga season with Stuttgart and was handed the number 33 shirt. On 30 July 2022, Marmoush scored his first goal for the club in a 1–0 first round DFB-Pokal match against Carl Zeiss Jena. Marmoush scored his first Bundesliga goal for the club in a 3–2 win over his former loan club VFB Stuttgart. On 24 January 2023, Marmoush scored his first goal in 2023 in a 5–0 rout over relegation strugglers Hertha BSC. Marmoush haunted his former club Stuttgart again as he scored the only goal in a 1-0 win at the MHPArena. Marmoush finished the season with 36 appearances, 6 goals and 1 assist in all competitions.
FC St. Pauli (loan)
On 5 January 2021, Marmoush was loaned to FC St. Pauli for the remainder of the season.[3] He played 21 games and scored 7 goals for the club. On 9 January, He scored his career goal against Holstein Kiel
VfB Stuttgart (loan)
On 30 August 2021, Marmoush was loaned out to VfB Stuttgart until the end of the season.[4] He scored a last minute equalizer against Eintracht Frankfurt on his debut. He was later named Bundesliga rookie of the month for September 2021. On 11 December 2021, Marmoush faced his parent club Wolfsburg and assisted Konstantinos Mavropanos's goal and in the 79th minute, Marmoush stepped up to take a penalty and he missed by hitting his panenka attempt off the crossbar. Marmoush was also named Bundesliga Rookie of the Month for March 2022.[5] He completed his loan spell having scored 3 goals in 21 games.
Eintracht Frankfurt
On 15 May 2023, it was announced that Marmoush would join Eintracht Frankfurt on a free transfer ahead of the 2023–24 season, and wear the number 7 shirt.[6] On 13 August 2023, Marmoush scored his first goal for Frankfurt in a 7–0 win over 1. FC Lokomotive Leipzig in the first round of the DFB-Pokal. On 27 August 2023, Marmoush scored his first Bundesliga goal for the club in a 1–1 draw against 1. FSV Mainz 05. On 21 September, he scored his first goal in European competitions from a penalty in a 2–1 win over Aberdeen during the Europa Conference League.[7] Marmoush had a brilliant debut season as he scored 16 goals in 37 appearances in all competitions. He attracted transfer interest from Premier League clubs such as Arsenal, Liverpool, Newcastle and Tottenham thanks to his magnificent debut season for Die Adler.[8] Marmoush scored a brace in Frankfurt's 3–3 draw with Borussia Dortmund and a goal in their thumping 5–1 win against Bayern. With 12 goals in the 2023–24 Bundesliga season, Marmoush became the third-highest African goal scorer.[9]
International career
Marmoush was included in Egypt's squad for the 2017 Africa U-20 Cup of Nations in Zambia. He made two appearances during the tournament, in which Egypt were eliminated in the group stage.[10]
On 19 March 2022, Marmoush was called up for Egypt's 2022 FIFA World Cup qualification third round matches against Senegal.[15] He played in both matches as Egypt were defeated 3–1 on penalties and knocked out of World Cup contention.[16] On 27 September, Marmoush scored the opening goal as Egypt beat Liberia 3–0 in a friendly match.[17]
Besides his Egyptian citizenship, Marmoush holds Canadian citizenship through his Egyptian Canadian parents who lived in Canada for six years before resettling in Cairo where Marmoush was raised and started playing youth football with Wadi Degla youth academy.[20]