Pittsburgh Steelers wide receiver Antonio Brown was sent back to Pittsburgh from camp to deal with a minor injury.
Head coach Mike Tomlin told reporters as much Thursday, although he pointed out the undisclosed injury was of the day-to-day variety.
Brown has established himself as one of the NFL's most valuable offensive weapons with at least 100 catches and 1,250 receiving yards in five straight seasons. He racked up 101 grabs for 1,533 yards and nine touchdowns across 14 regular-season games in 2017.
The 30-year-old Central Michigan product missed two contests with a partially torn calf suffered in a Week 15 loss to the New England Patriots last year.