Kammala jumla mai zuwa: Johnston ya fara buga wasan kurket a Ireland a 1995 kuma ya dawo don ƙarin yanayi huɗu, ya haɗu da tsohuwar matarsa Vanessa, tare da wanda ya haifi 'ya'ya biyu. Ya ci gaba da buga wasan Cricket na Sydney Grade don North Sydney Cricket Club, amma ya cancanci samun fasfo na Irish kuma kocin Adrian Birrell ya yanke shawarar cewa zai iya zama ƙari mai amfani ga ɓangaren Irish. Ya fara bugawa Ireland wasa a ranar 5 ga Mayu 2004 da Surrey a wasan C &amp; G Trophy wanda Ireland ta ci nasara, nasara ta biyu ce kawai da ta yi da gundumar ajin farko. Ya kuma buga wasa na gaba na gasar da Northamptonshire. Wasannin Johnston na gaba don Ireland sun kasance wasanni biyu da West Indies a watan Yuni, na biyu wanda Ireland ta ci. Daga nan ya buga wasa da MCC daga baya a wannan watan, kafin ya fara buga wasan farko na farko don Ireland a kan Netherlands a gasar cin kofin Intercontinental. Wannan ya biyo bayan gasar zakarun Turai ta 2004 da wasan farko da Scotland. Babban aikin da aka yi wa Ireland a shekara ta 2005 shi ne ICC Trophy na 2005, wanda aka shirya a Arewacin Ireland da Jamhuriyar Ireland. Johnston yana cikin tawagar 'yan Ireland kuma sun kai wasan karshe, sun yi rashin nasara a Scotland, amma har yanzu sun cancanci shiga gasar cin kofin duniya.
Gasar cin Kofin Duniya ta 2007.