The Raiders are losing of their defensive leaders.

Robert Spillane, the team’s leading tackler the past two seasons, agreed to contract terms with the Patriots on Monday. The deal can become official Wednesday.

The 29-year-old, who listed at 6-foot-1 and 229 pounds, was signed by the Raiders in 2023 and accumulated 306 tackles in two years as their starting middle linebacker.

Both Raiders starting linebackers last season — Spillane and Divine Dablo — are pending free agents, so the club could be looking at two new starters next season.

Spillane, who was undrafted out of Western Michigan in 2018, played for the Titans and Steelers before joining the Raiders.

Contact Vincent Bonsignore at vbonsignore@reviewjournal.com. Follow @VinnyBonsignore on X.