As per Mike Drago of the Reading Eagle
The hope is the Phillies need the roster spot and are just wanting to test to see if Joseph experiences any concussion symptoms. With Dugan to the DL the Reading OF should be Collier-Altherr-Perkins going forward. With Lino to Clearwater we could see more Willians behind the plate.
Tommy Joseph Update: Per Matt Gelb Joseph had concussion like symptoms and was a bit foggy. Th Phillies are concerned about the injury.