Spillane's signing is notable due to his familiarity with new Patriots coach Mike Vrabel. Vrabel gave Spillane his first NFL opportunity, signing him as an undrafted free agent for the Titans in 2018 out of Western Michigan.

The Patriots agreed to terms on a contract with free-agent LB Robert Spillane, according to a source. Spillane entered the NFL as an undrafted free agent out of Western Michigan with the Titans under Vrabel in 2018. After four years with the Steelers, Spillane signed with the Raiders in 2023 when McDaniels was head coach.

The Patriots made moves to bulk up their defense on Monday, reportedly signing linebacker Robert Spillane and cornerback Carlton Davis as NFL free agency kicked off.