The Browns drafted the 2012 Heisman Trophy winner with the No. 22 pick in the 2014 draft out of Texas A&M. He lost the quarterback battle to Brian Hoyer and will open the season as Cleveland's backup quarterback.
Manziel also had the top-selling jersey in the NFL during the first quarter of the league's fiscal year.
The Browns open the regular season on Sunday when they visit the Pittsburgh Steelers.
- Paul Palladino