The Las Vegas Raiders have already lost their starting quarterback, Gardner Minshew, to a season-ending shoulder injury. Now, his backup, Aidan O'Connell, is dealing with a serious injury.

O'Connell was injured in the third quarter of the Raiders' Week 14 loss to the Tampa Bay Buccaneers. It occurred as the second-year quarterback scrambled right and connected with Jakobi Meyers for an 8-yard game.

O'Connell was pushed from behind by Buccaneers defensive tackle Calijah Kancey after he threw a pass while scrambling to the right sideline. The Raiders quarterback remained down after the play and medical personnel attended to him.

Eventually, O'Connell was loaded onto a cart and taken off the field. His left leg was in an air cast, indicating that the quarterback had suffered a potentially significant injury.

Here's what to know about O'Connell's injury and who will replace him with the Raiders.

2025 NFL MOCK DRAFT: How high can elite RB Ashton Jeanty go in first round?

Aidan O'Connell injury update

NFL Network's Ian Rapoport reported Monday that tests revealed O'Connell suffered a bone bruise in his left knee during Sunday's game against the Buccaneers. He hasn't yet been ruled out for the Raiders' Week 15 "Monday Night Football" game against the Atlanta Falcons, so it doesn't initially appear that this injury is a long-term concern.

This development comes after Antonio Pierce implied O'Connell's injury might be serious during his postgame news conference on Sunday.

"Yeah, it doesn't look good," Pierce told reporters when asked about O'Connell's injury.

Instead, O'Connell could be the rare player who goes from wearing an air cast to playing just a handful of days after the initial injury.

O'Connell's injury occurred with 1:23 left in the third quarter of the Raiders vs. Buccaneers game. He was pushed to the ground by Kancey well after he released the ball. O'Connell banged his knees on the ground as a result of that push and had to be carted off the field.

The Raiders quickly ruled him out and clarified that O'Connell had suffered a knee injury. He finished the day completing 11-of-19 passes for 104 yards and an interception.

Raiders QB depth chart: Who is Aidan O'Connell's backup?

O'Connell will be replaced by his backup quarterback Desmond Ridder if he has to miss time. The third-year pro has only been with the Raiders since signing off the Arizona Cardinals practice squad on Oct. 21, 2024, but has seen action in two games this season.

Ridder has completed 16-of-26 passes with the Raiders for 138 yards and a touchdown. He hasn't yet made a start for the team, but he has a career record of 8-9 as a starter.

The Raiders have only one other healthy quarterback in their system besides Ridder: undrafted rookie Carter Bradley, who is currently on the team's practice squad.

Las Vegas could look to sign another quarterback if O'Connell's injury is as serious as it seems.

This article originally appeared on USA TODAY: Aidan O'Connell injury update: Raiders QB carted off vs Buccaneers