Mariota will be joined by fellow Heisman winner and No. 2 overall draft pick Jayden Daniels in Washington's QB room.
Mariota is in line to sign a one-year contract with the Commanders, Adam Schefter of ESPN reports.
Mariota played five of the Eagles' 72 snaps on offense and completed two of three pass attempts for 16 yards while carrying twice for six yards in Sunday's 42-19 loss to the 49ers.
Mariota will start Friday against the Colts, Jeff McLane of The Philadelphia Inquirer reports.
Mariota has gotten off to a slow start during training camp, Martin Frank of The Delaware News Journal reports.
Mariota has been an active participant at the Eagles' OTAs this spring, Jimmy Kempski of Philly Voice reports.
Mariota (knee) agreed to a one-year contract with the Eagles on Thursday, Adam Schefter of ESPN reports.
The Falcons released Mariota (knee) on Tuesday, Field Yates of ESPN reports.
The Falcons placed Mariota (knee) on injured reserve Wednesday.
Coach Arthur Smith noted Wednesday that Mariota (knee) is slated to undergo a knee procedure and is in line to be placed on IR, Tori McElhaney of the Falcons' official site reports.