Oar joins fellow Socceroo Tom Rogic, who helped Celtic make it into the group stages on Tuesday. 

However, Oar was not part of the APOEL squad that drew 0-0 with Slavia Prague, winning 2-0 on aggregate. 

The Australian winger played 52 minutes in the first leg, but did not make the bench in the return fixture on Wednesday. 

But Oar still took to Twitter after the game to celebrate APOEL's progression into the world's most prestigious club knockout tournament. 

The draw for the group stages will take place at 2am Friday morning AEST.