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As if the Bills didn’t have enough issues with the players who have shown up for offseason workouts, they apparently have one lingering issue with a player who hasn’t.

Via Tyler Dunne of the Buffalo News, the Bills have heard nothing from right tackle Seantrel Henderson since the 2015 season ended.

Henderson, the starting right tackle in 2014 and most of 2015, missed the last five games of the season due to Crohn’s disease. Per Scull, Henderson had surgery “a few months ago” for the condition. One source told Dunne that “nobody knows” whether Henderson will even be on the team in 2016.

Jordan Mills and Cyrus Kouandjio are the primary candidates to replace Henderson, if he doesn’t return to the team.

Crohn’s disease has a wide range of symptoms, consequences, and complications. Plenty of people have it and rarely suffer through any significant issues. Plenty also struggle with it, constantly. While the article notes that a team source questioned Henderson’s work ethic, with a reference to past marijuana issues, it’s entirely possible that Henderson is simply focused on his health — and that he chooses not to make his situation any more public than it needs to be.