The Raiders entered this free agency period needing defensive help throughout the depth chart. They signed presumptive starters earlier in this veteran acquisition process, but didn't stop there.
The Silver and Black have added depth this week especially, signing a key cog in linebacker Emmanuel Lamur on Wednesday afternoon.
Lamur spent the last two years in Minnesota and the previous four in Cincinnati with new Raiders defensive coordinator Paul Guenther. Guenther was his position coach from 2012-13 and his DC from 2014-15. He also knows Raiders linebackers coach David Lippincott from the Bengals days
Lamur has primarily been a reserve, but Guenther gave him an opportunity to start in 2014. He had 59 tackles and two interceptions in 13 starts that year as a strongside linebacker.
The Raiders have options at that spot, but no firm starter at this stage if Bruce Irvin plays defensive end full time.
Lamur hasn't played much defense the last two years, but is known as a quality special teams contributor. The Raiders have signed several of those players in an attempt to improve coverage and returns.
All told, the Raiders have signed 14 unrestricted free agents with a shot to make the 53-man roster since last week began. The roster will turnover significantly in Jon Gruden's return to the Raiders, and it's possible he signs more players in coming days.
The Raiders are still looking for upgrades at receiver, and might add another bargain defensive lineman.