Site Staff 
Celtic have had some brilliant players over the last few decades, but they have also had a few signings that supporters would probably rather forget.
That is always the risk at a club like Celtic when the expectation is huge, and every new signing is judged against the standards of players who have actually made a difference at Parkhead. When a player arrives for big money or with a decent reputation, the patience does not last very long if the performances just aren’t there. That scrutiny is also reflected in the wider attention around the club, with betting odds Premier League and other football markets providing another indication of the expectations surrounding major teams.
The problem is not always that the player is completely hopeless, because sometimes it is about poor timing, injuries, confidence or not being suited to the demands of a club like Celtic. But when a signing fails at Parkhead, it can become obvious very quickly, and once the pressure is on at Celtic there are very few places to hide.
For every fan favourite or cult hero, there has been a player who arrived with hope and left with supporters wondering what on earth had happened.
5. Albian Ajeti
Albian Ajeti’s move to Celtic looked understandable at the time, but it ended up becoming one of those transfers that only grew more frustrating the longer it went on.
Celtic needed a forward in the summer of 2020, with Leigh Griffiths drifting in and out of the picture and Odsonne Edouard needing proper competition. Ajeti had built a good reputation at Basel before his move to West Ham, and although things had not worked for him in London, there was still a feeling that he could rediscover himself in Scotland.
At first, there was even a reason to be optimistic after he came off the bench to score a winner against Dundee United on his debut, which is usually the kind of start that helps a striker settle.
The issue was that it never really became the beginning of anything and Ajeti did not look sharp enough very often, and the questions around his fitness and intensity followed him for much of his Celtic career. There were flashes of brilliance where he looked like he might offer something, but there was never the sense that he was going to become the reliable centre-forward Celtic needed.
For a player with a £5 million price tag, that is a major problem as Celtic can carry a cheap gamble that does not work, but when a signing arrives for that kind of money, he needs to do more than occasionally hint at being useful on the pitch.
4. Derk Boerrigter
Derk Boerrigter is one of those Celtic signings who looked exciting on paper and then spent most of his time proving why that can be misleading.
He arrived from Ajax in 2013, which was enough to get supporters interested before he had even kicked a ball. Ajax still carries a certain reputation, and a winger coming from that kind of background is always going to be expected to bring a bit of European polish. Instead, Celtic got a player who could never stay fit for long enough to build any kind of rhythm.
Injuries completely wrecked his time in Glasgow and every time there was a chance he might get going, something seemed to stop him in his tracks. That made it difficult for him to show what he could do, but it also made the transfer feel like a waste almost from the start.
Across three years, he made only a small number of league appearances and scored just once. When a player is signed for around £ 3 million, that return was nowhere near enough. There may have been some talent there, but Celtic fans barely saw it. Supporters do not remember Boerrigter as a player who was unlucky with one injury. They remember him as a signing who never got close to justifying the excitement or the money.
3. Shane Duffy
Shane Duffy’s loan move to Celtic should have been a guaranteed success, which is why it became such a painful one for everyone involved.
He was a Celtic supporter, an experienced Premier League defender and someone who seemed perfect for a title race built around pressure. Celtic were chasing 10 titles in a row, and Duffy was supposed to bring experience, leadership, toughness and security at the back.
Instead, the move unravelled from almost the word go, and the moment he arrived, Duffy looked like a player fighting himself. Mistakes crept into his game and his confidence drained away. The whole thing became uncomfortable to watch. He was not just below his usual level, because he often looked completely lost in a defensive structure that just never suited him. That is what made the signing so damaging.
Celtic were not bringing him in as a squad filler; he was supposed to be a senior figure in one of the most important seasons in the club’s modern history.
Once again, the financial side made it worse, with Celtic reportedly covering a large wage for a player who never became the stabilising presence they expected. By the end, it felt like both club and player needed the spell to end. Duffy has had a good career elsewhere, but his Celtic loan remains one of the clearest examples of a transfer that made sense in theory and completely failed in reality.
2. Vasilis Barkas
Vasilis Barkas arrived at Celtic with the difficult job of replacing Fraser Forster, and it is fair to say he never came close to making supporters feel comfortable, which is never a good thing for a keeper.
Celtic spent around £5 million to bring him in from AEK Athens, which is a serious investment for a goalkeeper in Scotland. The club needed someone commanding and reliable that was ready to handle the pressure of a season where every mistake would be magnified. Barkas did not give them that.
It is true that he was playing behind a poor defence at a bad time for the team, so it would be unfair to put everything on him. But goalkeepers at Celtic need presence, and Barkas rarely gave the impression that he was in command of his penalty area.
The moment many fans remember is the Conor Goldson header for Rangers that seemed to bounce past him far too easily. It was the kind of goal that confirmed what supporters had already started to fear. Once fans lose confidence in a goalkeeper, it is incredibly difficult to get it back and Barkas never really did.
The fee and the comparisons with Forster all made the situation worse, but the basic issue was simple enough. Celtic paid big money for a goalkeeper who did not look like the answer.
1. Rafael Scheidt
Rafael Scheidt remains the Celtic flop that almost feels far too obvious to ignore. Signed from Gremio in 1999 for around £5 million, he arrived with Brazil caps on his record and the kind of profile that should have suggested Celtic were getting a bargain. At that price, supporters had every right to expect someone who could immediately improve the team. What they got instead was one of the most infamous signings in the club’s history.
Scheidt made only a handful of appearances for Celtic, which tells the whole story before you even get into the performances. There have been plenty of disappointing signings over the years.
The problem with Scheidt is not just that he failed; it is that he failed so completely after arriving for such a big fee. In an era when £5 million was a massive fee in world football, the return was disastrous. But football was the real issue and Celtic signed a player who was supposed to be a major addition but ended up with someone who barely contributed before being moved on.
That is why he has to be number one on this list, where other players may have struggled, disappointed, flattered to deceive or failed to settle; Scheidt became the standard against which Celtic transfer disasters are still measured.
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