United's development squad will now kick-off their pre-season schedule with a trip to North Ferriby FC.
The newly formed club will host the Blades U23s at Church Road on Friday 5th July, kick-off 7.30pm.
Admission prices have yet to be confirmed, although it will be pay on the gate.
For those supporters making the trip to the fixture, the postcode for the ground is HU14 3AB.
The U18s will kick-off their league campaign on Saturday 10th August, with the U23s beginning their season two days later on Monday 12th August.