Redskins RB Derrius Guice having MRI

Redskins running back Derrius Guice will have an MRI on his knee Friday after leaving Thursday's preseason game with an injury.

Fantasy owners must hold their breathe anytime a running back suffers a knee injury, but early indications are that it is not serious, and that the MRI is precautionary. If Guice was to be out for an extended period of time, Rob Kelley and Samaje Perine would be in line for sizable workloads. Chris Thompson is not expected to be full strength until November.