A grim week or so it's been for Martin O'Neill and Celtic, although the issues at Parkhead stretch further back than that, the football on show a far cry from the swashbuckling displays of Ange Postecoglou's tenure.

After witnessing two derby defeats in succession, you can't help but look back to some of the performances put in against the club's Glasgow rivals under the Aussie's watch, that night in February 2022 always sticking in the mind.

The football on display in that 3-0 win was breathtaking, with Reo Hatate at the double as the Bhoys tore the then-champions apart in the first-half. It was relentless and breathless, the Ibrox side simply having no answer to it.

Looking to the present day, the men in green and white look a little toothless and short of ideas, the decision to extend O'Neill's stay perhaps already coming back to bite.

Why O'Neill should be under pressure at Celtic

Having not lost a derby across his two interim spells last term, the 74-year-old has since lost two in the space of seven days, with Celtic soundly beaten on both occasions.

Now, O'Neill, twice parachuted in to steady the ship in 2025/26, did a fine job to help steer the Parkhead side to the double last season, cementing his legendary status even more in Glasgow.

A dramatic final day against Hearts, followed by a Scottish Cup triumph over Dunfermline, looked like the perfect way to bow out, with the veteran coach not exactly expected to be a long-term solution in the dugout.

Perhaps unsurprisingly, this under-fire Celtic board took the easy option, with O'Neill belatedly deciding to stick around for at least another year, despite ongoing links to the likes of Jens Berthel Askou.

The Hoops have since wilted in Europe, amid comprehensive defeats to both LASK and Ferencvaros, while looking firmly second best up against Derek McInnes' men.

Again, the board is responsible for assembling this flawed squad, having, as ever, left it late to secure so many new arrivals, but the buck stops with O'Neill in terms of performance and results, as it does in terms of team selection.

With this extended international break offering time for both the Irishman and the club to take stock, it wouldn't be a surprise to see a change made over the coming weeks.

How Celtic can bring back Ange-ball to Parkhead

Chris Sutton may have viewed Cameron Carter-Vickers' post-match comments on Sunday as "disgraceful", but what the experienced centre-back had to say really was telling and damning in equal measure.

The 28-year-old highlighted the "random" nature of his side's performance, suggesting that they need to "get better at that, getting a script and sticking to it."

Reading between the lines, the players are heading out onto the field without a clear idea of how they are meant to perform, a stark contrast to the vision of Postecoglou's approach.

Celtic need another progressive, forward-thinking coach to shake things up again, as the Aussie did five years ago, with Kieran McKenna surely still an option to consider.

As Football FanCast exclusively reported, the 40-year-old is still the club's number one managerial target, having been interested in the young coach prior to appointing O'Neill.

The issue is that McKenna currently has his eyes set on a top-six job in the Premier League, while any suitor would have to pay an £8m compensation fee to Ipswich Town, if they are to hire the out-of-work coach before next summer.

A deal doesn't look likely, therefore, but Celtic would be wise to do all they can to tempt McKenna into changing his mind, while the financial package shouldn't be a concern for a club that happily spent over £10m on Sebastian Tounekti and Michel-Ange Balikwisha alone.

If they can pull off a deal, the appointment of the ex-Ipswich boss would be something of a masterstroke, with McKenna arguably "one of the best managers around", in the view of his former skipper, Sam Morsy.

He's a meticulous, modern manager, hailed by Manchester United hero Nicky Butt as "one of the best coaches [he's] ever seen on grass", following their prior work together at Carrington.

There wouldn't be any question over who's doing the coaching, with journalist Jonathan Wilson reporting how, over five years at Portman Road, McKenna never carried out the same drill in the same way. He's always adapting, always keeping his players on their toes.

That would feel like a breath of fresh air at Parkhead, and while McKenna did ultimately burn out by the end at Ipswich, hence his decision to leave over the summer, his record speaks for itself.

Having taken charge in December 2021, he ultimately oversaw three promotions and one relegation in his four full seasons in charge, notably taking the Tractor Boys from League One to the Premier League in double-quick time.

The key thing too is the manner in which he did it, certainly Postecoglou-esque, with the 2023/24 promotion campaign seeing McKenna's men lauded for their chaotic, free-flowing 4-2-3-1 style.

Ipswich finished second in the second tier that year, scoring 92 goals to lead the way in that regard, having played out from the back so freely and so successfully.

McKenna put his stamp all over Ipswich's approach, and that's what Celtic are in need of right now. He might well be the man to bring back something close to 'Ange-ball' in Glasgow.