Per C. Trent:
OAKLAND, Calif. -- It's looking like LHP Eddie Guardado will miss his self-imposed deadline for a return to the Reds:

Guardado has been returned from his rehab assignment.
He has been nagged by a stiff lower back.
Cincinnati Reds

When you rush back like he has, snags like this has to be expected, sooner or later anyway. It would be nice to get him back to see if he can build any trade value.