Allen remains week-to-week after damaging the ulnar collateral ligament in his throwing elbow. NFL Network's Tom Pelissero reported Tuesday the rookie is expected to miss 2-3 games.
McDermott confirmed Allen isn't expected to undergo surgery at this point.
Peterman's play necessitated giving the 35-year-old his first start in two years. Of the 15 drives Peterman has led this season, 10 have resulted in a punt or turnover. For his career, Peterman's interception rate of 11.4 percent ranks as the highest by any player since at least 1975, according to NFL Research. His game-losing pick-six last week in Houston cost the Bills a shot at a road win and likely led to the decision to go with Anderson under center.
"Derek's a guy that I've been around in Carolina. He brings experience, leadership, presence to the table, and he's worked hard over the last week and a half here to get up to speed," McDermott said Wednesday.
The Bills own one of the stingiest defenses in the NFL, ranking third in Football Outsiders' DVOA metrics. Offensive inefficiency and turnovers, however, have plagued Buffalo (2-4). With one of the most talent-poor offenses in the NFL, Anderson won't put up gaudy numbers. The best McDermott & Co. can hope for is that the veteran will take care of the ball better than Peterman and allow the defense to carry the load.