FILE - In this Oct. 12, 2017, file photo, Carolina Panthers' Luke Kuechly (59) is helped off the field after being injured in the first half of an NFL football game against the Philadelphia Eagles in Charlotte, N.C. For the third time in three years, the Panthers have to find a way to replace Luke Kuechly because of a concussion. Only this time, they don't have A.J. Klein to turn to. He signed with the Saints as a free agent meaning its David Mayo's turn to anchor the defense. (AP Photo/Mike McCarn, File) NY178
TAMPA — The Bucs have two key players sidelined with concussions, one for more than three weeks now, so players don't even need to look across the field on Sunday for a reminder of the shadow cast by concussions on the game they love to play.