Still in the league competition, and still a junior, Dongou scored his first goal for the Catalans' reserves on 25 March 2012, helping to a 2–1 home defeat of CD Alcoyano.[5] He made his first appearances with the main squad during the 2013 preseason, netting twice in his second in a 7–0 rout of Vålerenga Fotball.[6]
Dongou made his competitive debut with Barcelona on 6 December 2013, replacing Alexis Sánchez for the last 12 minutes of the 4–1 win at FC Cartagena in the round of 32 of the Copa del Rey and closing the score.[7] His first game in the UEFA Champions League came five days later, when he featured nine minutes in a 6–1 rout of Celtic in the group stage.[8] He completed a trio of debuts on 19 January of the following year, again coming from the bench away against Levante UD in the La Liga 1–1 draw.[9]
On 22 January 2016, Dongou signed with division two club Real Zaragoza after agreeing to an 18-month deal.[10] On 23 August of the following year, he joined fellow league team Gimnàstic de Tarragona on a four-year contract.[11]
On 10 July 2018, Dongou moved to second-tier side CD Lugo for two years after cutting ties with Nàstic.[12] The following 30 January, he signed with Segunda División B's Lleida Esportiu on loan until the end of the season with an option to make the move permanent in case of promotion.[13]
Dongou terminated his contract with Lugo on 8 August 2019.[14] In February 2020, he joined FC Honka of the Finnish Veikkausliiga.[15]
^Aldunate, Ramiro (19 January 2014). "Caparrós y el Tata frenan al Barça" [Caparrós and Tata stop Barça]. Marca (in Spanish). Retrieved 30 January 2014.
^"Dongou, nou fitxatge del Nàstic" [Dongou, new signing of Nàstic] (in Catalan). Gimnàstic Tarragona. 23 August 2017. Archived from the original on 31 August 2017. Retrieved 29 August 2017.