David Luiz says member of Chelsea's staff were begging him to return to the club shortly after his move to Arsenal.
The veteran defender swapped London clubs last summer.
He told OTRO: "I can be honest with you, the first three days or week was not easy to understand all the emotions or how I was feeling, because everybody knows my history with Chelsea.
"I had this connection with everyone at the club. It was so massive and big and I was missing every single one.
"Every text message I was receiving, people were saying, 'Come back, come back, come back, come back, we are here for you'.
"I give you the example of a gentleman there who is 75 years old. He was taking breakfast with me at the time when he had the opportunity.
"He was texting me, 'I am still waiting for you here to take the breakfast again'.
"This kind of thing was so difficult for me, because I am someone that sees the heart as the most important thing.
"But then after that, in the professional way, I was saying, 'It is a new moment for you. It is another big thing for you to do. Maybe if you stay in the comfort zone it is not going to be the best thing for you?'"