When the news dropped last week that Oakland Raiders star wideout Amari Cooper had suffered a hamstring injury that sidelined him on the very first day of OTAs, there was plenty of frustration from the fanbase.

Cooper dealt with plenty of injuries last season and wound up having the worst season of his young career to this point. While the injuries weren't the only cause for the 23-year-old's decline in production, it certainly played a role.

On Tuesday, the Raiders began the second week of OTAs and unfortunately, as Michael Gehlken of the Las Vegas Review-Journal revealed, Cooper was not back on the field from the original injury. To note, rookie cornerback Nick Nelson and second-year defensive tackle Eddie Vanderdoes were both sidelined as well as they work their way back from knee injuries.

But, Cooper wasn't the only receiver sidelined, as both Jordy Nelson and Seth Roberts were also not in action Tuesday, as Michael Gehlken also revealed. The reason for their absences is currently unknown.

Last season was a rough one for Cooper in terms of the aforementioned injuries. While he suffered a bad ankle injury and concussion in Week 12 against the Denver Broncos, quarterback Derek Carr revealed that the wideout went through much more than just that. As the signal caller told Eddie Borsilli of SiriusXM NFL Radio, Cooper played with injuries most people likely wouldn't have.

"He would never say it to you but I'll say it to you to have his back. That man was out there giving anything he could and honestly, a lot of guys probably wouldn't have played with what he had" Carr stated.

He finished 2017 with just 48 catches for 680 yards and seven touchdowns. While those numbers don't seem terrible, you have to factor in that 11 catches, 210 yards, and two scores came in a single game against the Kansas City Chiefs.

Cooper also somewhat salvaged his final stat line for the season in the final two games against the Philadelphia Eagles and Los Angeles Chargers, as he totaled 176 yards and two touchdowns in those two weeks combined. This was the first season of Cooper's young career that he's failed to top the 1,000-yard mark, but the expectation is certainly that he'll bounce back in a big way in 2018.

The Oakland Raiders are rolling through offseason practices and are gearing up for Jon Gruden's first season back on the sidelines! Want the latest news sent straight to your inbox? – Sign up for our FREE Raiders newsletter now!

Realistically, it wouldn't be surprising if Jon Gruden and the coaching staff were just playing it safe with their No. 1 wideout, while possibly giving Nelson and Roberts the day off.

We'll keep you updated, as this is only the first practice of the week, but his status for the next few days remains up in the air.