For now, the Bills only have Manuel and Orton on their 53-man roster at quarterback.
The Bills began training camp with Manuel, Tuel, Thad Lewis, and Dennis Dixon on their roster at quarterback. They waived Lewis and Dixon earlier this week, while the team also signed and released quarterback Jordan Palmer this week.
Tuel, 23, started one game last season -- a loss to the Kansas City Chiefs -- as an undrafted rookie from Washington State. He played in four games this preseason, completing 64.4 percent of his passes for two touchdowns and two interceptions.
Under the NFL's new rules, Tuel is eligible to return to the practice squad as soon as noon Sunday.