He made his debut for the first team, under Martin O'Neill, in the 2003/04 season and he later established himself as first choice central defender at Celtic during Gordon Strachan's managerial reign.
He made his debut for the first team, under Martin O'Neill, in the 2003/04 season against Hibernian, and finished that season with 5 league appearances as Celtic won the league. He later established himself as first choice central defender at Celtic during Gordon Strachan's managerial reign.