 Nyorera kuenderera kweiyi ndima - Musi wa1 Kubvumbi 2017, Williams aive wekupedzisira kutsiva akakuvara Conor Murray muMunsters line-up ye2016 17 European Rugby Champions Cup quarter-fainari vachipesana neToulouse. Munster akaenderera mberi kuhwina mutambo 4116 uye kufambira mberi kusvika kuma semi-fainari. Williams akawana 150th cap yake yeMunster musi wa10 Kukadzi 2018, achidaro paakatanga mumatunhu 335 kukunda Zebre mu201718 Pro14. Kukuvara kwechiso kwakakonzerwa panguva yekudzidzira pakutanga kwakarambidza Williams kwemwaka wese wa2017-18 mwaka, sezvo kuvhiyiwa kwaidikanwa, asi akaita nekukurumidza-kupfuura-kutarisirwa kupora uye akadzokera kunodzidziswa kuzere mukupera kwaApril. Williams akaburitswa neMunster pakupera kwemwaka wa2018 19. 