"I spoke with my agent and then from that moment on I left it up to him as I was on holiday," he said.
"I made my decision and then didn't speak too much about it."
Asked whether he had spoken to the Portuguese at all, he added: "No - I think he was busy with the game tonight (against Vitesse Arnhem).
"Things happen and sometimes it's not meant to be. Chelsea is a big club and sometimes it is difficult for young players to come through. I want to have a good career and I didn't want to spend 10 years on the bench, I wanted to make the best out of every year.
"This is a club with a lot of ambition and the right place to be. You don't have to have regrets in football. Choices have to be made.
"Mr Martinez will be one of the top managers in the world and for me to work under him now is the best thing that could happen for me."
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