Is he staying? Is he going?

The debate goes on (and on, and on). But you can count Justin Chambers among those who don't want T.R. Knight to leave the cast of Grey's Anatomy.

"T.R. is an amazing actor and I want him to be there as long as I'm on there," said Chambers, who plays Dr. Alex Karev on Grey's Anatomy, to E! Online the other night at the Salvatore Ferragamo benefit for L'Aquila Earthquake victims. "He's wonderful to work with."

Besides, T.R.'s character, Dr. George O'Malley, has so much growing to do.

"That's one of the great things about the show," Justin Chambers said.

"All the characters have so much left to explore. From the beginning of the series, the audience followed these young interns coming into this hospital and now they're residents ... but they still have much more to learn as far as surgery, social skills and manners."

For her part, former Grey's Anatomy guest star Melissa George said she's not convinced that Knight is leaving the show he's been on since its 2005 premiere.

No matter what happens, she said, "He'll go on to bigger and better things."

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.