"I loved every minute of the match and loved the week," the Kildare man said after his 80-minute run-out against the Barbarians.
"The atmosphere in the camp was brilliant. We worked very hard and we really enjoyed it and it showed against the Barbarians.
"There was no shortage of talent (on the pitch) and it shows you Irish rugby is in a very strong position at the moment."
Casey did not look out of place during the 39-14 win over the Baa Baas, jumping well in the lineout and he produced some timely turnovers at the breakdown also.
The 29-year-old is currently leading a poll on our website to find out 'which Irish player will have the biggest impact at the Churchill Cup?', and he is undoubtedly looking forward to prolonging his season.
"When your country comes calling you go and especially with the summers I've had off over the past few years, I'm just delighted to go (to the Churchill Cup)."
Asked if his performances this summer might help him force his way back into the Ireland senior squad, Casey was hopeful of further opportunities down the line.
"Obviously Ireland have some of the best second rows in the world. I've just got to keep believing and keep working hard with my club and, when I get a chance, take it.
"At this level, you learn how fit you are first of all. I learnt a bit about the lads I was playing with (against the Barbarians).
"The work-rate was phenomenal from the boys and from those who came on off the bench. There is no shortage of talent in Ireland - you saw some of our lads were very dangerous from broken play," he added.