Kit Harington, the actor who plays Jon Snow on Game of Thrones, and the star of an AMC show have both emerged as the frontrunners for the lead roles in Warner Brothers’ Arthur & Lancelot.

THR reports that Dominic Cooper of The Devil’s Double, Pirates of the Caribbean: On Stranger Tides actor Sam Claflin, Sherlock Holmes’ Hans Matheson, Jim Sturgess of Across the Universe and Hunger Games actor Liam Hemsworth read for the roles, but Harington and Joel Kinnaman of AMC’s The Killing did a screen test together two weeks ago in London.

Both actors are in a 30-day waiting period and the studio is expected to make a decision soon—although scheduling could affect the casting because of filming for both actors’ popular TV shows.