Until Thibaut Courtois' pen is on that new contract, Chelsea fans will be worried.

Real Madrid have seemingly been flittering between the Belgian and Manchester United's David de Gea as they consider potential replacements for Keylor Navas.

The Blues stopper is a couple of years younger than his Spanish counterpart, though it's the Red Devils goalkeeper who is widely considered to be the best in the world.

So, how will Zinedine Zidane decide between the two, if indeed he is still in charge come the summer?

It could well depend on whether the players in question are open to a move.

De Gea is thought to be relatively happy at Old Trafford, whereas Courtois has refused to rule out leaving Stamford Bridge.

"It’s not the right moment to make decisions," he told VTM Stadion in his homeland earlier this month.

"Not for me, not for Chelsea. The club know that too. In a few months, we’ll sit around the table again."

The former Atletico number one's personal situation is, of course, a big factor. His children live in the Spanish capital, which is obviously going to be a big pull.

How Courtois feels about a move

In fact, writing for AS, La Liga expert Guillem Balague has claimed that Courtois is so interested in joining Real that his representatives have now issued a 'come-and-get-me' plea. As instructed, they are now doing everything they can to convince Florentino Perez to splash out.

The player's agents have reportedly told the European champions "in no uncertain terms" that he wants a deal to happen, and the feeling is very much reciprocated.

Courtois' current contract expires in the summer of 2019 and Chelsea will be reluctant to allow him to enter its final year.

All that suggests that he will have a big decision to make at the end of this season.

If Balague's information is correct, then it seems he has already set his heart on a switch to the Bernabeu as he is insisting that if he is to stay, Roman Abramovich will essentially double his wages of £100,000 a week.

Kepa Arrizabalaga of Athletic Bilbao will also be linking up with Zidane in the New Year, so Courtois could complete the overhaul of their current goalkeepers.

Antonio Conte will no doubt be aware of his 'keeper's wishes and has therefore earmarked Sevilla's Sergio Rico and Atlético's Jan Oblak as his preferred choices to replace him.

Is Courtois the man for Real Madrid? Have your say in the comments.