 Nyorai kuenderera mberi kweiyi ndima - Muna 2007, aive nhengo yeIreland Under-20 Grand Slam inokunda squad. OBrien akashevedzwa kuchikwata cheIreland ku2009 November Tests, uye akawana kapu yake yekutanga paakauya semutsivi achipesana neFiji kuRDS Arena musi wa21 Mbudzi 2009. Akauyawo achitsiva kuSouth Africa mukukunda 15-10 musi wa28 Mbudzi 2009. Akabuda pabhenji achipesana neItaly mu2010 Six Nations Championship, asi akadonhedzwa mushure. Akakuvara panguva yeIrish 2010 Zhizha Tests, asi akahwina kutanga kwake kwekutanga kurwisa Samoa mu2010 Autumn Tests, kunyangwe asina kuratidzwa mune mimwe mitambo. OBrien akatanga mutambo wese weIreland panguva ye2011 Six Nations, kuhwina mubairo weMan of the Match vachirwa neItaly. 