Knighton became a free agent on Tuesday after spending two seasons with the Denver Broncos.
Last month, he said he wanted to stay in Denver and would be willing to take "somewhat of a hometown discount" to do so. He also said the longer Broncos management waited to negotiate with him, "the worse it is going to be."
The 28-year-old recorded 33 total tackles and two sacks in 2014. He spent the first four years of his career with the Jacksonville Jaguars.
- Molly Geary