Sean Smith has agreed to sign with the Oakland Raiders on a four-year, $40 million deal.

Smith will receive $20 million in guaranteed money.

Smith joins the Raiders after three seasons with the Kansas City Chiefs in which he improved their secondary at cornerback.

Smith played the first four seasons of his career in Miami after the Dolphins selected him in the second round of the 2009 draft.

The Oakland Raiders have agreed to sign Bruce Irvin.

Irvin is 28 and had 38 tackles and 5.5 sacks last season with the Seattle Seahawks.

Irvin was the 15th overall pick in the 2012 NFL Draft out of West Virginia.

Before the 2015 season began, Irvin said he planned to sign with the Atlanta Falcons in free agency.

The Oakland Raiders and Kelechi Osemele have agreed in principle on a contract worth approximately $60 million over five years. Osemele becomes the highest paid guard in NFL history.

Osemele is considered one of the most physical and versatile offensive linemen in free agency at the age of 26. He boosted his value last season when he switched from left guard to left tackle for the last four games. Osemele was also the Ravens' starting right tackle in the Super Bowl in 2012.

A second-round pick in 2012, Osemele built a reputation as a mauling run-blocker and sound pass-protector. 

The Raiders have amongst the most cap space in the NFL entering the offseason.