Whatever club you support, there will always be a transfer hoodoo attached to it; that’s certainly the case with Celtic.
Whether it’s seeing their best players leave the Bhoys or their failure to sign some of football’s brightest stars, those in the Parkhead think tank will be ruing some costly errors.
Perhaps the most famous of recent times is John McGinn. The midfielder is a Celtic supporter but, when the Bhoys came calling, a move didn’t materialise. They bid for his services when he was at Hibernian but he chose to move to Aston Villa in the Championship instead.
It was the hope of regular football which lured him to England and he hasn't looked back since. McGinn is now a mainstay in the Scottish national team and has even been touted at £50m in some circles.
However, there should be an even bigger regret over one of football’s greatest target men - Olivier Giroud.
The year is 2010, and with Tony Mowbray bidding to strengthen his Celtic squad in the winter transfer window, he turns his attention to a little-known Frenchman.
Giroud was playing his football for Tours in Ligue 2 at the time and finished that season with a grand haul of 23 goals in 41 matches.
Unfortunately, the Hoops weren’t able to get a deal over the line. A £2.5m move collapsed and Mowbray went and signed Morten Rasmussen instead. The Dane scored just two goals for Celtic, while Giroud has gone on to become a global star.
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His failed move is one that the Hoops should look back upon with regret. After all, they’d have probably made a fair profit on the France international.
He moved to Montpellier later that year, where he scored 25 in 42 during the 2011/12 campaign, when his side miraculously won Ligue 1.
A switch to Arsenal followed, where he became a star under Arsene Wenger. He wasn’t a regular goalscorer in English football but his days south of the border have been recognised among some of the greats.
Eden Hazard dubbed him the best target man in the world when he moved to Chelsea, before an overhead kick goal in the Champions League saw the Frenchman labelled “out of this world” by Glenn Hoddle.
Giroud has since won the World Cup with his country and, once he retires, he will go down as one of Les Bleus' greatest players.
The 34-year-old has 107 caps to his name, scoring 44 goals in the process. That record puts him above the likes of Zinedine Zidane, David Trezeguet and Michel Platini. In fact, he is France’s second-top scorer in their history, just seven strikes behind the legendary Thierry Henry.
Giroud was a spiky-haired youngster when Celtic failed to sign him all those years ago. Now he’s a towering presence playing for one of the best clubs in world football. He is very much one that got away for the Hoops.