5 free agent defensive linemen still available the Buffalo Bills could sign

Atlanta Falcons v Carolina Panthers
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Calais Campbell

One of the oldest defensive linemen in the NFL is Calais Campbell however he doesn't appear to be slowing down any time soon. This upcoming season will be his 17th in the NFL and played for the Atlanta Falcons this past year and had 6.5 sacks, 10 tackles for a loss, and 17 QB hits,

While he may not be the dominant player he was with the Cardinals or the Jaguars between 2014 and 2019, he is very consistent with double digit QB hits in 13 straight seasons and has started double digit games every year in his career except for his rookie season.

Around this time last year, the Bills reportedly had Calais Campbell in for a free agent visit. It ultimately didn't end up in a contract as Campbell would sign with the Falcons but there is a need once again on the defensive line and Campbell would be a great veteran presence for this defense.