Sandra Oh makes it clear she won't ever return to Grey's Anatomy

Los Angeles Times

“No,” Oh said when the Los Angeles Times asked whether she has considered a return to Grey’s. “I love it, though, and this is also why I really appreciate the show … that I still get asked this.” Oh added that the longer she has been away from Grey's, the more she's been able to appreciate Cristina Yang. “It’s very rare, I would say, to be able to see in such a way the impact of a character,” said Oh. “In some ways, you do your work as a bubble and you let it go. I left that show, my God, seven years ago almost. So in my mind, it’s gone. But for a lot of people, it’s still very much alive. And while I understand and I love it, I have moved on."