Rodney Hudson
The Raiders have the best center in the league in Rodney Hudson, and he is locked up for next season. The issue is, he becomes an unrestricted free agent for the 2020 season, and will be expensive, but he is well worth the money at this point.
The relationship between Derek Carr and Hudson is a good one, and there is nothing more important to a quarterback than his center. In Hudson, he has one of the more elite offensive linemen in football, and as the team moves to Las Vegas, they are going to want to lock him up for more years, as he is only entering his 30s.
With rookies on the outside of the line, Hudson has served as a leader in the huddle for the Raiders. They cannot afford to try and work in a new center moving forward, so the plan should be to get an extension done with him so they do not have to worry about it for the next couple of seasons.