The artist, who has not worked for the publisher since his popular series was dropped, revealed that he is working on an unnamed project with writer Christos Gage.
DC's then-president Paul Levitz cancelled The Boys back in 2007, only for it to be picked up by Dynamite Entertainment within a month. Robertson continues to work on the title, which has now published more than 65 issues.
Robertson is also collaborating with Grant Morrison on his Image Comics project Happy!
"Everything I'm currently working on I am really enjoying. Wrapping up the final issue of The Boys, [there's also] a new co-created, creator-owned series with Cristos Gage for DC Comics," he told The LA Times.
"I am especially loving Happy! as Grant has given me such an original story to work with and it hits a lot of my artistic strengths. It's a very cinematic story and it flows very well."
Robertson's new creator-owned venture is expected to be revealed in the near future.