In total, Tottenham have spent £45 million on Sebastien Bassong, Younes Kaboul, Eric Dier, Jan Vertonghen, Federico Fazio and Etienne Capoue over the past five years.
White Hart Lane is proving to be a very difficult place to settle in if you're a centre-back, however, as even William Gallas struggled when he signed for free in the 2010/11 season.
Since Ledley King and Michael Dawson were both at their best, there simply hasn't been a solid centre-back pairing at Tottenham - and it is the main cause of their inability to break into the top four. But why?
Kaboul was questionably named as captain for the 2014/15 Premier League season at Spurs - despite the fact he struggles to make the squad on some occasions.
Fazio proved the rumours about La Liga defenders to be true after a woeful first season in the Premier League - he was named in the Liga BBVA Team of the Year last year.
Tottenham need better
Vertonghen had a strong first season in England, helping to try and justify his heft £12.5 million price tag. Unfortunately, he has struggled ever since that first season, and Tottenham thought he would return to his best and form a solid partnership with Fazio this season. They thought wrong.
However, the most baffling decision was to shell out £8.5 million on a certain Vlad Chiriches.
Despite receiving the Man of the Match award on his debut, the big Romanian has looked incompetent ever since and is caught up in a long list of failed Spurs purchases of recent years.
A cheeky late loan bid from Roma in January was rejected by Tottenham, but it is likely he will move away from London permanently in the summer.
Tottenham should probably look for a centre-back who has consistently performed well in good leagues and is proven, like Dawson and King were - rather than risky scout recommendations from poor leagues, like Chiriches and Capoue.
Which centre-back should Tottenham attempt to sign this summer? Have your say in the comments below!