Only one per nation - can't have Blissett and Barnes together, can't have Jennings and McClelland together.
He probably doesn't remember managing Celtic either. Goalkeeper is the tricky position - there must be someone better than Karnezis but, other than Jennings, I can't think of one who was capped whilst playing for us.
How about Tony Meola? He only played once for Watford, but was playing for the USA in the same season he was at the Vic.
I did think of him but a) wasn't sure that he played for the USA whilst with us, and b) including him would mean leaving out Jay Demerit. Also thought of Mart Poom - but can't remember if he was capped for Estonia whilst with us.
In that case, my XI would be: Mart Poom Lloyd Doyley John McClelland Jay Demerit Jose Holebas Ikechi Anya Kenny Jackett Adlene Guedioura Roberto Pererya Luther Blissett Heidar Helguson