Christian mcaffrey San Francisco 49ers running back the 49 ER of Christian mcaffrey dealing with CF and achilles issues is questionable for Monday night's game against the Jets after practicing in limited fashion all week mcaffrey stated to reporters on Friday he had no doubt he'd suit up for the opener and was hoping to handle a normal workload if the star running back were to be limited in any way or suffer a setback Jordan Mason and rookie fourth round pick Isaac gendo would be in line to handle any additional opportunities