Martin O’Neill says his previous achievements with Celtic shouldn’t put him beyond scrutiny in the present moment.After returning to Parkhead for the second time last season, the Northern Irishman guided the club to an unlikely league and cup Double to go with the seven major honours he won between 2000 and 2005.Having agreed to stay in charge for this term at least, O’Neill’s new-look side started brightly only to suffer a drastic loss in form in big matches.A catastrophic collapse away to LASK in the Champions League play-off was followed by a comprehensive defeat to Rangers in the Premier Sports Cup last Sunday.With Ferencvaros easing to a 3-1 victory in the Europa League on Thursday, the 74-year-old is under intense scrutiny — with some supporters believing he’s now running out of road.Comfortable that his past successes offer him no protection from the flak which is now flying his way, the Northern Irishman isn’t concerned that his reserves of goodwill appear to be running low. Martin O’Neill accepts that he must carry the can for Celtic’s recent poor run of results‘I never thought like that,’ he said. ‘You are only as good as your last game at the end of the day.‘And I mean that. It doesn’t bother me. That call [to change manager] could easily be my brother at the end of the day.‘So, what I’m saying is that it doesn’t bother me now in that sense.‘Does winning and losing bother me? Of course that does. But if you lose football matches, you will get criticised. And we’ve lost the two big games there in the week. So, I accept that.‘Honestly, I’ve never worried about legacy. I’ve said this before and it’s worth repeating. Jock Stein can talk about a legacy. The rest of us are just followers.’Celtic welcome Rangers to Parkhead tomorrow for the first Premiership meeting of the season. While O’Neill’s men could open an eight-point gap with a win, another defeat would see Derek McInnes’ men move to within two points of them ahead of the international break.Asked if those who were now doubting him offered extra motivation,’ O’Neill added: ‘You would hope that would be the case, you know. And you would want to try and win.‘As I said before, nobody questions tactics when you’re winning football matches. Celtic’s Europa League campaign for off to a dismal start with a 3-1 defeat to Ferencvaros‘When you lose a game or two, yeah, of course, everything’s under scrutiny. That’s the nature of it. And I’m not going to change that.‘I’m not surprised. I’m not on social media or anything like this. But nothing surprises me in that aspect.‘And should I get more time and things? No. No, I don’t think so.’Meanwhile, Celtic have added Mark Keane and Raymond Buchanan to their board as non-executive directors.Keane, who is the son of former Celtic chairman John Keane, is the founder of Slievemore, a Scotland-based family investment office, and will take up his position immediately.Former BBC political correspondent Buchanan, who is currently director of corporate affairs at Scottish Water, will join at the end of his present role.The pair replace Peter Lawwell and Tom Allison who recently retired.