The Oakland Raiders open up the preseason Saturday night against the Los Angeles Rams, which means it's time for a training camp tradition like no other – the release of the team's first unofficial depth chart.

Now, before we take our first look at how the 90-man roster is currently constructed, I feel obligated – once again – to remind you that this depth chart is unofficial, which means that is subject to change, and it's almost certain to look different once Head Coach Jon Gruden's team straps on the pads for real, for real, on September 9.

You can check out the full depth chart, here, and below are six observations to go along with it.

1. Structurally, the Raiders list three wide receivers

In years past, we've seen the Silver and Black list just two columns of wide receivers on their depth chart, but with their first iteration of 2019, the team is going with three pass catchers.

Unsurprisingly, Antonio Brown and Tyrell Williams have two of those starting slots, but in a move that could come as a surprise to some, rookie wideout Hunter Renfrow has the third one.

Renfrow is listed as the first slot receiver on the depth chart, clocking in ahead of Ryan Grant and De'Mornay Pierson-El, and after a really nice start to training camp, it stands to reason that the former Clemson Tiger earned that title.

Now, will Renfrow have to take full advantage of the preseason to stay in that spot? He sure will, but props to the young fella for showing the coaching staff what he can bring to the offense.

2. The youth movement

Renfrow isn't the only Raiders rookie to earn a starting spot on the team's first unofficial depth chart, as all three of the Silver and Black's first rounders from this year's draft (Clelin Ferrell, Josh Jacobs and Jonathan Abram) sit at the top of their respective position groups.

Abram technically is listed on the same line as Lamarcus Joyner, but the fact remains, we're going to see a lot of No. 24 in 2019.

After a disappointing season a year ago, Coach Gruden and General Manager Mike Mayock were open about the fact that they needed the players they selected in this year's draft to come in and contribute right away, and all indications are those hopes are on track to come to fruition.