Rubuta ci gaba don wannan sakin layi - Courtois ya ci gaba ta hanyar tsarin matasa na Genk, kuma yana da shekaru 18, ya taka muhimmiyar rawa a nasarar da kungiyar ta samu a gasar Pro League ta Belgium. A watan Yulin 2011 ya koma Chelsea a kan £ 8 miliyan, kuma nan da nan aka ba shi rance zuwa Atlético Madrid. A cikin yanayi uku a can, ya lashe gasar Europa a shekarar 2012, da Copa del Rey
a shekarar 2013 da La Liga a shekarar 2014. Ya kuma lashe kyautar Ricardo Zamora Trophy don mafi kyawun mai tsaron gida a La Liga, saboda wasan kwaikwayonsa a cikin kakar wasa biyu na ƙarshe. Courtois ya koma Chelsea a watan Yulin 2014, kuma a kakar wasa ta farko ya taimaka musu lashe Kofin League da Premier League. Shekaru biyu bayan haka, ya lashe Gwanin Zinare na Premier yayin da Chelsea ta sake lashe gasar. A cikin 2018, Real Madrid ta sanya hannu kan Courtois akan £ 35 miliyan, ta zama mai tsaron gida mafi tsada a La Liga, wanda ya zarce rikodin da Jan Oblak ya kafa. Ya lashe taken La Liga na biyu da kuma na uku Zamora a shekarar 2020.