grealish played gaelic football to a high standard , even appearing at croke park five years ago in a match during half-time of a dublin v kerry senior game .
on his debut for john mitchels , a gaa club in warwickshire , he received a mighty blow and appealed to the referee .
` this is n't soccer , jack , ' clobbered by two fouls against liverpool in sunday 's fa cup semi-final win , picking himself up each time .