Commanders head coach Dan Quinn announced that Chenal underwent season-ending neck surgery Monday.
The fifth-year linebacker required the procedure after he was carted off the field in the second quarter of Sunday's 33-31 win over the Seahawks, when he appeared to lead with his head while tackling running back Emanuel Wilson. Chenal had tallied 18 tackles over the Commanders' first three games, starting the last two in place of the injured Frankie Luvu (groin).