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Bills news: Joe Brady issues warning to James Cook about fumbles.

Buffalo Bills star running back James Cook III has become a focal point of the offense after leading the NFL in rushing yards last season with 1,621, but his ball security has emerged as a growing concern. Cook has already fumbled four times in the first five games of 2026, bringing his total to 11 fumbles over the past 24 games—a stark contrast to his earlier career, when he managed just six fumbles in 750 touches across his first three seasons.

The issue has drawn direct attention from head coach Joe Brady, who warned that Cook’s fumbling habit could lead to a reduction in his workload if it doesn’t improve soon. Brady emphasized the seriousness of the problem, noting that costly turnovers nearly cost the Bills a recent victory over the Los Angeles Rams, despite the team’s eventual win.

The concern is particularly acute as the Bills prepare for a Week 6 matchup against the Las Vegas Raiders, where Cook’s reliability will be under further scrutiny.

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