The 25-year-old, who is currently under contract at Stamford Bridge until 2019, is believed to be on the radar of Real Madrid.
Courtois spent three seasons on loan at Atletico Madrid and his wife and children still live in the Spanish capital, a considerable factor in his future position in West London.
In an interview with Belgian publication Sport/Foot Magazine, the player confirmed that talks are ongoing with Chelsea, but also spoke about his love of Madrid.
"My personal situation is related to the city of Madrid," Courtois said. "My two children live there with their mum. I have my daughter every day on FaceTime. She often tells me that she misses me. My son is still too small to communicate like that.
"Whenever I have the opportunity, I try to return to Spain. As a situation, it is not always easy. Yes, my heart is in Madrid. It is logical and understandable.
"If they want me, they have to contact Chelsea. We'll see. But they have not done that. What is certain is that one day I will return to Madrid. I love Spain, I love the city, I spent three wonderful years there. It is there that I became an adult.
"Atletico was a real group of friends. We went out together and my team-mates taught me a language I did not know at all when I arrived. When I left, I cried. My first days in London were not easy. England, when I arrived, was colder, more business. Now, I feel very good here.
"I understand that the rumours are coming back today, as we are talking about a new goalkeeper there [at Real]. But I do not pay much attention to that, I stay focused on Chelsea. If Real are really interested, my personal situation could influence things. The family aspect is priceless. But I repeat to you that, for the moment, I'm busy talking to Chelsea to extend."
Courtois has made 141 appearances for Chelsea, keeping 54 clean sheets.