He has started three games, and with Allen Reisner on injured reserve, Harbor will be the starter until Marcedes Lewis returns from his calf injury.
Harbor has caught nine passes for 117 yards and one touchdown, but he said he can help as a blocker.
“I pride myself on my blocking,” he said. “I’m not a tight end who just wants to run around and catch passes. I try to be physical to the best of my ability.”