Ridder will remain the Raiders' backup to Gardner Minshew for Sunday's game against the Dolphins, Paul Gutierrez of ESPN.com reports.

Ridder took over for an ineffective Gardner Minshew with 5:02 remaining in the third quarter of Sunday's 41-24 loss to the Bengals and completed 11 of 16 passes for 74 yards with a touchdown and no interceptions while rushing once for two yards and losing a fumble.

Raiders head coach Antonio Pierce said Friday that Ridder will work as the backup to Gardner Minshew during Sunday's game against the Chiefs, Heidi Fang of the Las Vegas Review-Journal reports.

Ridder was signed by the Raiders off of Arizona's practice squad Monday, Tom Pelissero of NFL Network reports.

The Cardinals signed Ridder to their practice squad Wednesday, Tom Pelissero of NFL Network reports.

The Cardinals are slated to waive Ridder on Tuesday, Ian Rapoport of NFL Network reports..

Ridder cleared the league's concussion protocols Monday, Josh Weinfuss of ESPN.com reports.

Ridder is in concussion protocol following Sunday's 38-12 preseason loss to the Cardinals, per head coach Jonathan Gannon, Darren Urban of the Cardinals' official site reports.

Ridder looks set to start Saturday's exhibition opener against the Saints, and potentially Arizona's following two preseason contests, after coach Jonathan Gannon said Tuesday that Kyler Murray will not play until Week 1, Josh Weinfuss of ESPN.com reports.

The Falcons are trading Ridder to Arizona in exchange for wide receiver Rondale Moore, Tom Pelissero of NFL Network reports.