The 49ers signed Lucas to a one-year deal Friday, Mike Garafolo of NFL Network reports.
The 2022 seventh-round pick spent the first two seasons of his career with the Lions, but he's now found a new home in San Francisco. Lucas primarily served as a member of the special-teams units in Detroit, playing a total of 311 snaps (305 on special teams) and recording four tackles across the last two years. He's expected to compete for a similar role in San Francisco this offseason.