Studio insists nothing's official despite rumor

“Grey’s Anatomy” could be saying farewell to cast members Katherine Heigl and T.R. Knight – but studio insiders stress that nothing’s official.

That’s despite an Us Weekly report citing co-star James Pickens Jr., who told the magazine’s website that both Heigl and Knight are splitting at the end of the season.

An insider said that none of the show’s talent has been informed of any cast changes – and that right now, the only person who knows for sure what’s going on is series creator Shonda Rhimes.

The potential departures of Heigl and Knight have been rumored for months, but so far the stars, producers and studio have remained mum on the issue.

An ABC Studios spokesperson would only say that the studio and network are not confirming any changes to the show.

Pickens told US Weekly of the potential changes at an NAACP luncheon.

Follow @Variety on Twitter for breaking news, reviews and more