Tottenham's three centre-backs have done an outstanding job this season, with Federico Fazio deemed not required and sent out on loan to Sevilla.
A permanent exit looks likely, and Tottenham will have to decide in the summer whether to promote Cameron Carter-Vickers, or make a new signing with the Champions League presenting a greater challenge next year, with Tuttomercatoweb reporting they maintain interest in Torino's Kamil Glik.
One of the difficulties they face is attracting a player of sufficient quality that he would be an upgrade on a young player in their academy, but would also be willing to accept being third or fourth choice.
There are dozens of options they could add from across Europe, but perhaps the best fit would be one of the most controversial... former Arsenal captain Thomas Vermaelen.
Vermaelen spent five years at Arsenal between 2009 and 2014 before leaving for Barcelona, where his first season was written off by injury.
This time around he has made 14 appearances, but is not a regular with Gerard Pique and Javier Mascherano first choice, and Football Espana report via Marca, that he is to be made available in the summer.
Vermaelen and Tottenham may seem like an odd pairing considering his history and injury trouble, but he ticks the boxes if the club are looking to add experience for their Champions League campaign next season.
He is familiar with the Premier League and used to playing alongside either and both Toby Alderweireld and Jan Vertonghen and international level with Belgium, also knowing compatriots Mousa Dembele and Nacer Chadli. The quintet would quickly make Vermaelen feel welcome.
At 30 and having dealt with injuries, Vermaelen would not be expecting to play week in and week out, but could be a solid fourth choice who when called upon, is will be able to slot in and is also capable of playing at left-back, and scoring himself as he often proved for Arsenal.
A deal would require a bit of open mindedness from both club and player, and there would certainly be countless Arsenal fans unhappy at the move, but that is not a reason for Tottenham to back off.