Buffalo Bills running back Boobie Dixon could miss up to a month after pulling his calf muscle, coach Rex Ryan has told The Associated Press.
Ryan provided the update Wednesday, when the Bills returned to training camp following a day off. Dixon was hurt Monday.
Ryan couldn't specify an exact timetable because he said calf injuries are "usually tricky."
Dixon called the injury a "minor setback" in posting a note on his Twitter account Tuesday.
Dixon is a fifth-year player entering his second season with Buffalo. He was a dependable backup last year, when he had a career-best 432 yards rushing and a touchdown while filling in for injured starters Fred Jackson and C.J. Spiller.
This year, he's competing for a backup spot behind Jackson and newly acquired starter LeSean McCoy.