Lee signed with Buffalo on Wednesday, Maddy Glab of the Bills' official site reports.
The Bills need all sorts of depth at linebacker, but they solved some of their issues Wednesday by signing both Lee and Tyrell Adams. Lee doesn't appear in line to start in 2021, and he may have to impress to land a permanent roster spot. If that happens, he'll strengthen the linebacking crew for a playoff-contending team. Lee, a former Raider, didn't play in 2020.