Cathal O'Sullivan and Co. have shown they 'belong' after stepping up to Ireland U21s 

Much like Spurs-bound wonderkid Mason Melia - who misses out through injury - and more before the St Patrick's Athletic front-man, they've not only fit right in at the under-21 level. 

PRECOCIOUS TALENT: Cathal O'Sullivan of Cork City before the SSE Airtricity Men's Premier Division match between Cork City and Shelbourne. Pic: Michael P Ryan/Sportsfile

The young talents that exist within the League of Ireland have become integral to Jim Crawford's Republic of Ireland under-21 set-up of late. 

With a substantial chunk of his current squad actively playing for or having progressed through the ranks at domestic clubs, that is no different this time around.