The defensive end gets a one-year deal from the Raiders.
Willis has been with the 49ers since 2020, following a trade from the New York Jets on October 27, 2020. He's recorded 7.5 sacks in a rotational role since arriving in Santa Clara.
The Cincinnati Bengals made Willis (6-4, 270) a third-round selection (No. 73 overall) out of Kansas State in 2017. He registered 12 tackles, three tackles for a loss, two sacks, four quarterback hits, and a forced fumble through nine game appearances last season, per Pro Football Reference.
Willis, 27, has recorded 92 tackles, 10.5 sacks, a pass defensed, and three forced fumbles in 69 game appearances (two starts) through his six NFL seasons with the Bengals, Jets, and 49ers.
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