The centre-back joined Leeds United from Limerick last season.
The 19-year-old is right to feel nervous, knowing as he does that he has a huge chance to impress new Whites manager Thomas Christiansen this summer. But now he has his feet under the table at Elland Road the young Irishman will be desperate to seize every chance that comes his way.
O'Connor signed for Leeds from Limerick in early March, and after a few run-outs for the under-23 side he has been included in first-team training as the Whites gear up for a huge campaign.
O'Connor will not be the only youngster to get chances in the upcoming friendly matches, but having already racked up 39 senior appearances for Limerick (scoring three goals in the process) he will know what he is capable of.
Leeds have a number of exciting young players on their books, however when it comes to defence O'Connor could have jumped to the front of the queue following Jack Vann's release at the end of last season.
Big things were expected of Vann, yet now it is the Irishman's chance to prove his worth and it would only take an injury or two to see him propelled up the pecking order.
Christiansen is expected to sign a new centre-back to replace Kyle Bartley in due course. However, O'Connor has a while to prove he can be more than just a fringe player and his every kick could be scrutinized by Leeds' latest boss both on the training field and in the pre-season matches to come.