Gore was previously informed by the Indianapolis Colts that they would not retain him for the 2018 season, allowing him to test free agency.
The veteran running back rushed for 961 yards and three touchdowns in 2017, adding 29 receptions for 245 yards and another touchdown across 16 games.
Gore, a five-time Pro Bowler, ranks fifth all time with 14,026 career rushing yards, making him the NFL's active leader. It's likely he'll pass Curtis Martin (14,101) for fourth place during the upcoming season.
If Gore does sign with the Lions, he would compete with runners Ameer Abdullah and Theo Riddick for touches out of the backfield.
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