AP

The impressive comeback season for Cardinals running back Chris Johnson has hit a bump in the road.

Johnson has suffered a fractured tibia, according to Jay Glazer of FOX Sports. It’s not clear how much time Johnson will miss, but it’s likely a significant period of time.

That’s a big blow to the Cardinals: Johnson is fourth in the NFL with 814 rushing yards this season and has been a big part of the 9-2 Cardinals’ offense.

With Johnson out, David Johnson and Andre Ellington will split carries in Arizona’s backfield. Ellington, however, is dealing with a toe injury, and his prognosis is uncertain. So the depth in the Cardinals’ backfield may have just gone from a strength to a weakness.