Peterman was 5-of-18 passing for just 24 yards and two interceptions when he was replaced. It was Peterman's third career start after he went 11 of 24 for 123 yards, one touchdown and five interceptions in two starts as a rookie fifth-round pick in 2017.
Allen, 22, was taken seventh overall in April's draft after the Bills traded up five spots to grab him. He was given a chance to compete for the starting job in the preseason, but an ugly outing against the Cincinnati Bengals (6 of 12, 34 yards, five sacks took) hurt his chances.
Peterman was named the starter after a strong preseason, and free agent signee AJ McCarron was traded to the Oakland Raiders.
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