O'Brien out to make instant impression
O'Brien has replaced David Wallace at openside for Saturday's autumn international against Samoa at Aviva Stadium as one of 10 changes to the side edged by South Africa.
The 23-year-old made his debut last November and has been limited to just three Test appearances from the bench.
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Hide AdBut having been given his opportunity, he intends making the No 7 jersey his own.
He said: "Hopefully I will have a good game and then selection will be up in the air the following week against the All Blacks."