Suh, 28, is set to become a free agent after the Detroit Lions decided against using the franchise tag on him, which would have been a $26.9 million cap hit. Detroit still has the opportunity to re-sign Suh.
The Raiders are projected to have more than $50 million in cap space.
The Lions selected Suh with the No. 2 overall pick in the 2010 draft. The 28-year-old has earned four Pro Bowl nods and has been selected to four All-Pro teams.
Over 16 games last season, Suh recorded 54 tackles and 8.5 sacks while helping the Lions rank first in the NFL in rushing defense.