Pedzisa mutsara unotevera: Apedza kudzidza pachikoro cheConnacht, O'Halloran akasainwa chibvumirano chekuvandudza mwaka wa2011-12. Mwaka iwoyo wakaona Connacht ichikwikwidza kuHeineken Cup, makwikwi epamusoro eEuropean makwikwi, kekutanga. Musi wa11 Mbudzi 2011, O'Halloran akarova Connacht yekutanga kuyedza mumakwikwi achipesana neHarlequins mumutambo wekutanga. Akaratidzawo Connacht mukukunda 36<unk>10 kuToulouse muna 2006 uye kurasikirwa kwe23<unk>19 kurwisa Gloucester, achiwana imwe yekuedza kurwisa Gloucester. O'Halloran akabva atamba mukurasikirwa kwe24-3 neToulouse asi akatamba mukukunda kwekutanga kwedunhu reHeineken Cup apo Connacht akakunda Harlequins 9-8. Mu
2011<unk>12 Pro12 O'Halloran akarova miedzo mumitambo miviri vachipesana neCardiff Blues pamwe chete nemiedzo Leinster neGlasgow Warriors. Mumutambo we20 wemitambo, O'Halloran akarova muedzo mukukunda 26 <unk> 21 pamusoro peUlster kuti atore huwandu hwake hwekuedza kusvika mashanu muPro12 uye manomwe mumakwikwi ese.