Shunsuke Nakamura
Born in Dublin, O'Dea played for Home Farm before he was signed by Celtic as a teenager. After making his way through the reserves and academy side, he made his first-team debut for Celtic in the Scottish League Cup against St Mirren in September 2006. A month later, O'Dea made his league debut against Inverness Caledonian Thistle, where he played the last thirty minutes after substituting for Gary Caldwell. His UEFA Champions League debut was on 6 December against Danish club F.C. Copenhagen as a substitute for the injured Stephen McManus. O'Dea made his first league starting appearance against Dunfermline Athletic four days after his Champions League debut. Later that month he scored his first goal in a match against Dundee United, with his rebound of a 78th-minute free kick by Shunsuke Nakamura tying the match 2–2. O'Dea's first season saw him also score against Livingston in the run to the 2006–07 Scottish Cup.