Coen will take the same role under Mark Stoops at Kentucky.
Ridder will get his first start in New Orleans against the Saints.
Miller initially gave himself an internal return window on Week 14 to begin play again. His injured reserve placement means he will miss that window.
Allen started two games for the Texans after surpassing Davis Mills.
Garoppolo was replaced by Brock Purdy during Sunday's game against the Miami Dolphins.
The former number-one overall pick had both the worst DVOA of three starting Panthers quarterbacks and also the most opportunities to start among said quarterbacks.
Dallas Cowboys owner Jerry Jones expressed his concerns about Odell Beckham's ability to make an impact until 2023.
Robinson served as the general manager of the Titans since 2016.
In the Aftermath of Week 13, here is all the latest injury news in one place.