O'Reilly played for the Redcliffe Dolphins in the Brisbane Rugby League, and was part of their first premiership since 1965 when they defeated the Wests Panthers in the 1994 grand final.
[4] After the 2000 World Cup he had trials with the Salford City Reds.
[1] O'Reilly made his representative début during the Super League war, playing in two "test matches" against Australia.
In 2000, O'Reilly made his début for Papua New Guinea, against Australia in a warm up match for the 2000 World Cup.
He was selected for the tournament and played in all four matches for Papua New Guinea.