MARTIN O’NEILL has challenged his players to show that they have what it takes to cut it at Celtic Park.Sunday’s dismal defeat at Ibrox saw the Parkhead club knocked out of the Premier Sports Cup at the quarter-final stage.The 3-0 humbling came hard on the heels of the capitulation in Austria to LASK which saw Celtic eliminated from the Champions League play-off after being four goals up on aggregate.O’Neill men face Ferencvaros in the Europa League opener on Thursday evening before a home clash in the Premiership with Rangers on Sunday.And the veteran, who’s seen ten new players arrive this summer, feels all concerned now face a defining test of character in the two games prior to the international break. ‘That’s exactly what it’s all about,’ said the Celtic boss.‘It’s about wanting to have what it takes to be a Celtic player, as is the case across the way.‘What does it take? It takes big character. You have to accept the fact that even at home, you misplace the ball two or three times, the crowd can get on you. It happens all over the place, but it seems to be magnified (here). You’ve got to be able to fight that.‘The great Tommy Burns once said it’s easier to play against Celtic than to play for them which is a really good point.‘I had never had the luck to play for Celtic, so I don’t know that aspect, but I feel it and I have managed the team.’ Martin O’Neill wants his players to prove they are good enough for CelticSecond best throughout a one-sided derby, O’Neill admitted that it’s been hard for him and his players to process the nature of the defeat.‘I’ve never been able to shake things off early,’ he explained. ‘I’ve been saying this and it’s been a message to players throughout my managerial time that defeat should hurt.‘And if you’re smiling or laughing or joking about an hour after the match is over, then I don’t think it’s the best sight in the world and I don’t think you’ve treated the game with the seriousness that it deserves.‘So, that’s the point. I think that should be the message anyway to the players. They should hurt and some of the newer players.‘The game itself was as you would expect an Old Firm game to be played, high intensity and I think it was an eye-opener to some of the newer lads.‘So, you’ve got to find out about players, about whether they’re capable of dealing with these games. Hopefully, over the course of time, they will be, but yeah, it was a surprise.‘I think last year when we played Rangers a couple of times at Ibrox and we brought in some new players who found them difficult matches, I wasn’t surprised.‘I was surprised that they might have been surprised at the time, so that was the point. But yeah, we’ll pick up from there.’Meanwhile, O’Neill has revealed Camilo Duran is available to face the Hungarians despite missing training yesterday.Called up by Colombia for the first time, the forward had to travel to an embassy in London to get a visa. Camilo Duran should be available to face Ferencvaros after travelling to London for a visa‘They gave us two other dates, one of which was a game. That might have been difficult. The other one just didn’t suit us at all,’ explained O’Neill.‘I think the appointment was about 8 o’clock in the morning, so he had to go down the night before.’Asked if it had disrupted his preparation, the manager said: ‘It doesn’t help. It’s a bit like (Haissem) Hassan on Sunday.‘He had to leave the hotel, things that happened at home.‘His sleep patterns were done for in that sense. We decided not to start him in the game.‘Duran’s fit enough just to have missed the day training. We’ve done some set-pieces that he would like to see, but he will see them tomorrow morning in the positions that hopefully he would be in or not.’