Can anyone clear this one up for me. This is a Republic of Ireland semi pro squad for a 4 nations tournament being held in England from May 23rd. Competeing sides are Ireland,England,Scotland, Wales. It's not an U 21 squad, 'cos if it is there are a few bangers on it,it may be a league representative squad; the name doesn't suggest this though. The headscratcher is that Mark Mc Chrystal[Derry City] is named in the squad, and he's also named in Northern Ireland's U-21 squad for a friendly game against Scotland this week???