Al-Hassan beganmemulai hiskariernya careerdengan withtim the youth team ofmuda [[Al- Fateh SC|Al-Fateh]]. HeIa mademelakukan hisdebutnya debut onpada 1 JanuaryJanuari 2021 indalam the leaguepertandingan matchliga againstmelawan [[Damac FC|Damac]], replacingmenggantikan [[Saqer Otaif]].<ref>{{cite web |title=AL ITTIFAQ VS. AL BATIN 3 - 0|url=https://int.soccerway.com/matches/2021/01/01/saudi-arabia/pro-league/dhamk/al-fath-alahsa/3400465/}}</ref> ByDengan doingmelakukan soitu, heia becamemenjadi thepemain youngesttermuda playeryang topernah evertampil appear in thedi [[SaudiLiga ProfessionalProfesional LeagueSaudi]] – breakingmemecahkan therekor recordyang previouslysebelumnya helddipegang byoleh [[Fahad Al-Muwallad]].<ref>{{cite web |title=الحسن يحطم رقم المولد |url=https://arriyadiyah.com/716109}}</ref> OnPada 9 FebruaryFebruari 2021, Al-Hassan made his firstmelakukan start forpertamanya theuntuk clubklub intersebut thedalam 1–1hasil drawimbang 1-1 againstmelawan [[Al-Nassr FC|Al-Nassr]].<ref>{{cite web |title=AL FATEH VS. AL NASSR 1 - 1 |url=https://int.soccerway.com/matches/2021/02/09/saudi-arabia/pro-league/al-fath-alahsa/al-nasr-riyadh/3443242/}}</ref> OnPada 2 September 2022, Al-Hassan signed hismenandatangani firstkontrak professionalprofesional contractpertamanya withdengan theklub clubtersebut.<ref>{{cite web |title=الفتح يوقع مع 11 محترفا|url=https://arriyadiyah.com/780012}}</ref>
On 27 June 2024, Al-Hassan joined [[Saudi First Division League]] club [[Neom SC|Neom]] on a five-year contract.<ref>{{cite web |title=«نيوم» يعزز صفوفه بنجم الأخضر عباس الحسن |url=https://aawsat.com/%D8%A7%D9%84%D8%B1%D9%8A%D8%A7%D8%B6%D8%A9/%D8%B1%D9%8A%D8%A7%D8%B6%D8%A9-%D8%B3%D8%B9%D9%88%D8%AF%D9%8A%D8%A9/5034899-%D9%86%D9%8A%D9%88%D9%85-%D9%8A%D8%B9%D8%B2%D8%B2-%D8%B5%D9%81%D9%88%D9%81%D9%87-%D8%A8%D9%86%D8%AC%D9%85-%D8%A7%D9%84%D8%A3%D8%AE%D8%B6%D8%B1-%D8%B9%D8%A8%D8%A7%D8%B3-%D8%A7%D9%84%D8%AD%D8%B3%D9%86}}</ref>
