French sports, daily L'Equipe reports that Tie has just signed the first professional contract of his very young career, and the Franco-Ivorian is now contracted to the West London club until the summer of 2021.
But, while Chelsea have sealed the long-term future of one goalkeeper, that of another looks unclear.
Courtois, who is contracted at Stamford Bridge until 2019, has previously said his "heart" is in the Spanish capital as his family remains based there following his multi-year loan spell with Atletico Madrid.
It has been well documented that Courtois' children are based in Spain and he would prefer to be closer to them on a regular basis.
'I love living in London.
"My kids are the most important for me".
"Chelsea and Roma are interested in signing Leicester City goalkeeper Kasper Schmeichel".
The former Atletico shot-stopper said being closer to his children in Madrid was crucial, although any decisions over his future will not be made until Belgium's World Cup campaign ends.
When asked about joining Real Madrid after Belgium's 3-2 win over Japan on Monday evening, Courtois replied: 'I'm not going to talk about that now.
Courtois is a protracted transfer target for Real Madrid, who are desperately seeking to add a world class goalkeeper to their ranks this summer.