Former Celtic manager Gordon Strachan has recently opened up about the interesting circumstances that led to the signing of Gary Caldwell from Hibernian in 2006, and how former Celtic striker John Hartson played a key role in bringing the defender to Celtic Park.

The Surprise Move
When Gary Caldwell joined Celtic on a free transfer from Hibs, many fans were left scratching their heads. After all, the Scotland international wasn’t necessarily a marquee name, and his arrival from another Scottish Premiership club raised a few eyebrows. However, Strachan has now revealed that there was more to the deal than met the eye.
Speaking about the signing, Strachan said: (The Scottish Sun), “Caldwell signed for nothing from Hibs. People were scratching their heads and asking why we’d bought him.”
Despite the initial confusion, Strachan insisted there was a strategic plan behind the move.
John Hartson’s Key Role
The decision to sign Caldwell was influenced by none other than former Celtic striker John Hartson. Strachan explained that he consulted Hartson on who the toughest centre-back in the league was, a question that would ultimately lead to the signing of the defender.
Strachan went on: “The truth behind it is that I’d asked John Hartson who the hardest centre-back in the league was.”
Hartson was quick to point out Caldwell, recognising his toughness and ability to dominate in the air. Hartson’s insight proved invaluable to Strachan, and the signing of Caldwell was soon confirmed.
A Changing Game and Caldwell’s Role
When Caldwell arrived at Celtic, the game was evolving. Football was shifting towards a more technical style, and defenders were becoming expected to play out from the back and contribute to build-up play. Caldwell, known for his composure and passing ability, was ahead of his time in this respect. Strachan reflected on how Caldwell was one of the first “real ball-playing centre-backs” to make an impact in Scotland.
“He was one of the first real ball-playing centre-backs,” Strachan remarked, emphasising the change in the style of play that would become more prominent in the years to come.

Legacy at Celtic
Caldwell’s time at Celtic would go on to be a successful one, with the defender playing a crucial role in the team that dominated Scottish football during Strachan’s tenure. The centre-back helped the Hoops win multiple league titles and played an integral part in the 2007-08 Scottish League Cup victory.
Strachan’s story on the move for Caldwell highlights how even small details, like asking Hartson for advice, can lead to major signings that make a huge impact on a club’s success. Celtic fans will no doubt continue to remember Caldwell’s contributions from 2006 until 2010 fondly.
In the end, it was more than just a signing – it was the result of a former player working alongside the club for its benefit, with John Hartson’s insight playing a huge role in making it happen.