Colin Kaepernick is seeking receivers to catch his passes and a team to sign him.
Kaepernick, who led the San Francisco 49ers to a Super Bowl appearance following the 2012 season, last played in the NFL in 2016, the same year he started kneeling during the national anthem to protest racial injustice.
On Sunday, he wrote on Twitter: "For The past 5 years I've been working out and staying ready in case an opportunity to play presented itself. I'm really grateful to my trainer, who I've been throwing to all this time. But man, do I miss throwing to professional route runners.