Croom (hamstring) hasn't participated in minicamp practices yet this week, Joe Buscaglia of WKBW.com reports.
The Bills haven't indicated Croom's absence is anything serious. While missed practice time this time of year isn't normally a huge concern, Croom's role for Week 1 could go from anywhere to starting tight end -- projected No. 1 Tyler Kroft has a broken foot -- to not even making the team. With that in mind, Croom's participation and performance this summer is crucial toward his future.