The Oakland Raiders were greeted Monday with very bad news, as they learned starting quarterback Derek Carr is going to be sidelined for at least two weeks.

Adam Schefter of ESPN was among the first to break this piece of bad news for the Raiders, who are already going through a tough stretch after losing their last two games to the Washington Redskins and the Denver Broncos, respectively.

Carr injured his back in the third quarter of the Raiders’ 16-10 loss last Sunday to Denver. He wasn’t able to return to the contest and had to be replaced by backup EJ Manuel under center. Carr’s injury was primarily assumed as back spasms, but further tests proved it was more than just that.

Carr may not be out for long, however, as pointed out by Ian Rapoport in another tweet while using former Dallas Cowboys’ quarterback Tony Romo as an example.

The Raiders’ passing game will rely on the arm of Manuel while Carr is out of commission. Manuel, who had 106 yards on 11-of-17 completions with an interception against the Broncos, signed a one-year, $800,00 deal with the Raiders back in March to serve as Carr’s backup. In 29 career games since being selected by the Buffalo Bills in the first round of the 2013 NFL Draft, Manuel has 3,608 passing yards, 19 touchdowns, and 16 interceptions.

The Raiders get the bumbling Baltimore Ravens at home in Week 5 and the Los Angeles Chargers in Week 6. The soonest Carr could return based on his recovery timetable is Week 7 against the Kansas City Chiefs, a pivotal matchup for Oakland.