Allen, who was selected by the Bills with the seventh overall pick of the 2018 NFL Draft, will spend most of his time with the third-team group. McDermott noted that the 6-foot-5, 237-pound Allen will get occasional snaps with the starters, however.
"He's worked hard ... this has been part of the plan from the start. But give Josh credit, he's earned it," McDermott said, per Sal Capaccio of WGR 550.
Quarterbacks Nathan Peterman and A.J. McCarron have taken the starting reps thus far this offseason for the Bills.
McCarron, signed as a free agent in March after being a backup with the Cincinnati Bengals, is the front-runner for the starting job. He has played in 11 NFL games but has not started one since 2015.
Peterman started two games for the Bills last season, and the team went 1-1 in those starts. He completed 49 percent of his passes with two touchdowns and five interceptions in the four games he played last season.
Allen threw for 1,966 yards with 19 touchdowns last season at Wyoming.