Name: Mark O'Brien
Date of birth: 20/11/1992
Place of birth: Republic of Ireland
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Related Mark O'Brien News
O'Brien added to Ireland squad
Derby defender Mark O'Brien has been named in the Republic of Ireland Under-21 squad for their friendly against Holland.
O'Brien delighted to be back
Derby defender Mark O'Brien is delighted to have finally put his injury nightmare behind him.
O'Brien ruled out for season
Derby County defender Mark O'Brien will miss the rest of the season after suffering a knee injury in training.