But who are some of the best to come through the academy since 2000? Kieran TierneyPhoto by Robbie Jay Barratt – AMA/Getty ImagesKieran Tierney’s Celtic career Year Year Joined 2005 Senior debut 22 April 2015 Debut against? Callum McGregorCallum McGregor’s Celtic career Year Year Joined 2001 Senior debut 15 July 2014 Debut against? James ForrestJames Forrest’s Celtic career Year Year Joined 2002 Senior debut 1 May 2010 Debut against? Aiden McGeadyAIden McGeady’s Celtic career Year Year Joined 2000 Senior debut 24 April 2004 Debut against?