The Azzurri fell 2-0 in an international friendly hosted by the Belgian city of Liege.
"It's a shame. Ireland did pretty much nothing throughout and scored on a set play and on the counter," moaned the Juventus defender.
"I still can't understand how we managed to lose 2-0 after that performance from both sides.
"With a little more grit and determination, what we had on Friday against Estonia, it would've ended a very different way.
"All due respect to Ireland, but they haven't got much quality in this side and it irritates me to have lost against them."