Yahoo Sports reports: Baltimore Ravens defensive end Calais Campbell believes his 19th NFL season will likely be the final chapter of a remarkable career that has spanned nearly two decades. “I always tell myself — and this year I feel it as strongly as ever — that this is probably going to be my last year,” Campbell said following Tuesday’s minicamp practice. Campbell, who turns 40 in September, remains one of the NFL’s most respected defensive linemen and leaders despite entering his 19th season.