The young Rovers duo both played the full 90 minutes, as Ireland's Under-21s drew 0-0 with Denmark in Fredericia.
After an uneventful first half, the visitors had to play with 10 men for 40 minutes following the dismissal of defender Sean McGinty shortly after the restart.
O'Connor, who spent last season on loan at Burton Albion, came closest for Noel King's side, but the defender steered his header just wide from a Sean Murray free-kick on the hour mark.
Aston Villa's Samir Carruthers almost won it for Ireland on 78 minutes, but he just failed to connect with a dangerous low cross, whilst at the other end, substitute goalkeeper Sean McDermott made two impressive saves to deny the Danes late on.
The Irish begin their UEFA Under-21 Championships qualifying campaign against the Faroe Islands on August 14th.