Top 20 non-Scot Celts

While I am not an out and out plagiarist, I do not mind pinching ideas and adapting them into a Celtic shape. This piece was inspired by an article in the Dundee United v Celtic programme for 7 March whereby the Tannadice prog editor, the well-known United historian Peter Rundo listed the top 20 no-Scots who had played for the club. Second place went to one-time Celt Willo Flood (behind fellow Irishman Sean Dillon) so I was curious to see how non-Scot Celts would shape up...