Agent Erik Burkhardt congratulated Amendola on social media Saturday for the "well-earned deal," which is for one season, according to a Fox Sports report.
The 34-year-old Amendola had 62 catches for 678 yards and a touchdown in his first season with the Lions in 2019 -- the second-highest yardage total of his career.
Going undrafted out of Texas Tech, Amendola has made the playoffs five times in his career, winning two Super Bowls with New England. In the playoffs, he has 57 catches for 709 yards and six touchdowns.
Also a kick and punt returner throughout his career, he has 1,821 punt return yards and 3,575 kick return yards. He's returned at least one punt in every season of his career.
ESPN's Michael Rothstein contributed to this report.