As the likes of David Beckham, Zinedine Zidane and more recently Isco have stated in past years: when Real Madrid want you, it's impossible to say no.
Reports today claim that Real Madrid have reached an agreement with Thibaut Courtois for the Belgium international to run down his contract at Stamford Bridge before coming to the Bernabeu to replace either Diego Lopez or Iker Casillas in two years' time.
And despite his allegiance to Atletico Madrid, where he has spent the last two-and-a-half seasons on loan, Courtois would be stupid to turn down the opportunity to spend the best years of his career at the world's biggest club.
The chance to become Casillas's long-term successor at Real Madrid would appeal to any ambitious young goalkeeper - and it's no surprise that Los Blancos have identified Courtois, rather than Manchester United's David de Gea, as the ideal potential signing.
The danger for Real Madrid is that Jose Mourinho uses Courtois as his first-choice 'keeper at Stamford Bridge from the start of next season, and the Belgian becomes settled in west London.
But the likelihood is that Mourinho will stick by Cech next season and expect Courtois to work his way into the starting XI.
Most players would be perfectly fine with this scenario. But even though Courtois is just 21 years old, he needs nobody to inform him that he is already one of the world's best goalkeepers, and capable of walking into Chelsea's starting line-up ahead of Cech.
Mourinho would be foolish to start Cech ahead of Courtois next season; however, if the Belgian indicates that he has no desire to sign a new contract, then the Portuguese coach would be well within his rights to stick with Cech for the next few seasons.
Rather than allow Courtois to run down his contract and risk losing him for nothing in 2016, Chelsea should seriously consider the idea of selling him to Real Madrid this summer.
It's possible they could receive a fee of around £20m - and that, obviously, would be better than nothing.
Ultimately, Mourinho's decision to allow Courtois to spend a third season on loan at the Vicente Calderon has cost Chelsea the most talented goalkeeper to emerge for years.
In fact, it's fair to say that Courtois is the most gifted 'keeper to break through since Casillas.
And it would be fitting if the best goalkeeper of the current generation is replaced by the best goalkeeper of the next generation in between the sticks at Real Madrid.
Courtois can cement his status as the best in the business at the Bernabeu, but could he really do the same at the less glamourous Stamford Bridge?