There was a notable lack of empty seats at Celtic Park, with some supporter groups planning a boycott in recent days in protest against the leadership of the club’s board.
O’Neill was encouraged by the prospect of interaction between fans and the club and spoke about the need to refresh his team immediately before the match.
He made five changes and six substitutions to the starting eleven during scheduled time.
It took until Tonetti came on in the 70th minute for Celtic to really get their footing and on-loan Freiburg forward Adamu’s goal was one of the few times the hosts threatened in the six-yard box.
Tunacty’s winner, followed by a low one-two with sub Luke McCowan, left Dundee frustrated and they rarely looked likely to get an equalizer which would have resulted in a penalty.
He said Steven Pressley’s side had done nothing wrong until Adamu’s goal and they would consider themselves unfortunate to exit the cup after such a great effort.
For O’Neill, the three-pronged focus is on leaders Hearts chasing the Premiership title and a Europa League tie with Stuttgart on the horizon, as well as defending champions Celtic for continued participation in the Scottish Cup, a trophy they won three times between 2001 and 2005.
<a href=