The actor told TV Guide that the show has been relegated to a "s**t time slot".
Warburton said: "The scripts are great and we're having a lot of fun doing the show, but God knows if anybody's gonna find us on Saturday night.
The show's sixth season premiere was recently postponed, moving from September 24 to October 8.
Warburton said: "It seems like they're just keeping us midseason once again. They'll run us on Saturdays and if they've got a slot that opens up in the week, they'll put us back out. But nobody's excited about Saturday night."
The Family Guy star also hinted that the new slot could spell the end for Rules of Engagement.
"This is probably our last year of the show," he said. "The show does really well in reruns, and if they want to syndicate, they need to get to 100 episodes. So they're doing that to us."
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Watch a clip from Rules of Engagement below: